<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:6d1da0a7-d53b-4dd6-85ac-c219ee8ed624,g:1cc4f521-a698-49d8-af1f-e303eff6f7c0-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.avis.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="car-20250930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_c34ea6d6-8a81-4b3f-9e7b-b5cf25baa5bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_6661e7f6-1e90-45bf-b2b7-eb0d4d8f746d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_c34ea6d6-8a81-4b3f-9e7b-b5cf25baa5bd" xlink:to="loc_us-gaap_StatementTable_6661e7f6-1e90-45bf-b2b7-eb0d4d8f746d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_48eda91a-7d07-43b0-b243-cabf9f1c83bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_6661e7f6-1e90-45bf-b2b7-eb0d4d8f746d" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_48eda91a-7d07-43b0-b243-cabf9f1c83bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_48eda91a-7d07-43b0-b243-cabf9f1c83bb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_48eda91a-7d07-43b0-b243-cabf9f1c83bb" xlink:to="loc_us-gaap_EquityComponentDomain_48eda91a-7d07-43b0-b243-cabf9f1c83bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_69b103d7-1c48-4e1f-b1b6-db708159f2be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_48eda91a-7d07-43b0-b243-cabf9f1c83bb" xlink:to="loc_us-gaap_EquityComponentDomain_69b103d7-1c48-4e1f-b1b6-db708159f2be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_70a97331-9a4c-406a-9ad4-047fb640af29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_69b103d7-1c48-4e1f-b1b6-db708159f2be" xlink:to="loc_us-gaap_ParentMember_70a97331-9a4c-406a-9ad4-047fb640af29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_43f712bc-0c0c-4ffd-b037-992253aa3146" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_70a97331-9a4c-406a-9ad4-047fb640af29" xlink:to="loc_us-gaap_CommonStockMember_43f712bc-0c0c-4ffd-b037-992253aa3146" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_bd556c48-e2e3-44a4-89bf-81e3f0311408" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_70a97331-9a4c-406a-9ad4-047fb640af29" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_bd556c48-e2e3-44a4-89bf-81e3f0311408" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_6cae4b1e-6ead-41e1-b536-41702352bc96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_70a97331-9a4c-406a-9ad4-047fb640af29" xlink:to="loc_us-gaap_RetainedEarningsMember_6cae4b1e-6ead-41e1-b536-41702352bc96" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_2e5d75bb-e8b9-4a7e-b63a-3d2d23f8d534" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_70a97331-9a4c-406a-9ad4-047fb640af29" xlink:to="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_2e5d75bb-e8b9-4a7e-b63a-3d2d23f8d534" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_71c0446b-14fd-4286-ba41-1334c492ec57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_70a97331-9a4c-406a-9ad4-047fb640af29" xlink:to="loc_us-gaap_TreasuryStockCommonMember_71c0446b-14fd-4286-ba41-1334c492ec57" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_1d5c645c-4a0e-4e79-9f40-2a54aea51565" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_69b103d7-1c48-4e1f-b1b6-db708159f2be" xlink:to="loc_us-gaap_NoncontrollingInterestMember_1d5c645c-4a0e-4e79-9f40-2a54aea51565" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c34ea6d6-8a81-4b3f-9e7b-b5cf25baa5bd" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_84e0b8d9-935b-4739-ac16-5a184cedd040" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_84e0b8d9-935b-4739-ac16-5a184cedd040" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_dfd03be8-5ee3-4683-bd30-bcbcb24a38ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_dfd03be8-5ee3-4683-bd30-bcbcb24a38ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_962823b7-d25f-4d03-bb81-3463ae46a42a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:to="loc_us-gaap_TreasuryStockCommonShares_962823b7-d25f-4d03-bb81-3463ae46a42a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_ec183dfd-f8f4-4660-9164-6d6b0b33c3ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_ec183dfd-f8f4-4660-9164-6d6b0b33c3ee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_612b0b28-c141-4a46-b932-d69517d780f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_ec183dfd-f8f4-4660-9164-6d6b0b33c3ee" xlink:to="loc_us-gaap_ProfitLoss_612b0b28-c141-4a46-b932-d69517d780f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3a5d091d-66f5-4a3e-bd8a-51753fdb80ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_ec183dfd-f8f4-4660-9164-6d6b0b33c3ee" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3a5d091d-66f5-4a3e-bd8a-51753fdb80ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_378a067a-f7e7-40e2-86ef-a622694d63f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract_ec183dfd-f8f4-4660-9164-6d6b0b33c3ee" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_378a067a-f7e7-40e2-86ef-a622694d63f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest_a3b8b229-ef29-45eb-ad9e-f4fac6bf113f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest_a3b8b229-ef29-45eb-ad9e-f4fac6bf113f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_a0c13427-f711-4b2e-ab3b-2c2abd53e510" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_a0c13427-f711-4b2e-ab3b-2c2abd53e510" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition_f114979b-dda8-44e2-a0a1-bbcd493d9dbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition_f114979b-dda8-44e2-a0a1-bbcd493d9dbc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_25b63123-a75d-4e92-84fd-b7cb42b61caf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_25b63123-a75d-4e92-84fd-b7cb42b61caf" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_73ee3678-05d7-413b-8479-3dac31132d39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_dcd1bd87-78e3-4c1e-9d2c-2649f37a37fb" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_73ee3678-05d7-413b-8479-3dac31132d39" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_1e3318dd-0b6c-49a9-a724-b48b707e9080" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_426082e8-7fa0-4731-9656-35683be09be2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_49bfca6a-3de7-41a3-94c7-dff57c065087" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/BasisofPresentationNarrativeDetails" xlink:type="simple" xlink:href="car-20250930.xsd#BasisofPresentationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/BasisofPresentationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_547f2865-e2cc-4b55-85cc-c43c0d19f4b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_9e321987-ebab-4e9a-8869-d77e89f66847" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_547f2865-e2cc-4b55-85cc-c43c0d19f4b5" xlink:to="loc_us-gaap_DebtInstrumentTable_9e321987-ebab-4e9a-8869-d77e89f66847" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_47de6064-f8d3-4815-bdf2-2766a1ecb358" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9e321987-ebab-4e9a-8869-d77e89f66847" xlink:to="loc_srt_ProductOrServiceAxis_47de6064-f8d3-4815-bdf2-2766a1ecb358" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_47de6064-f8d3-4815-bdf2-2766a1ecb358_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_47de6064-f8d3-4815-bdf2-2766a1ecb358" xlink:to="loc_srt_ProductsAndServicesDomain_47de6064-f8d3-4815-bdf2-2766a1ecb358_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_508cd153-882f-4f58-b1c5-fb9a558328a3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_47de6064-f8d3-4815-bdf2-2766a1ecb358" xlink:to="loc_srt_ProductsAndServicesDomain_508cd153-882f-4f58-b1c5-fb9a558328a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RoyaltyMember_c7654354-3f75-4e3a-b3d0-452e2aabe1ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RoyaltyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_508cd153-882f-4f58-b1c5-fb9a558328a3" xlink:to="loc_us-gaap_RoyaltyMember_c7654354-3f75-4e3a-b3d0-452e2aabe1ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_15472876-1726-46ba-9f6b-bebc8849cdf9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9e321987-ebab-4e9a-8869-d77e89f66847" xlink:to="loc_srt_OwnershipAxis_15472876-1726-46ba-9f6b-bebc8849cdf9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_15472876-1726-46ba-9f6b-bebc8849cdf9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_15472876-1726-46ba-9f6b-bebc8849cdf9" xlink:to="loc_srt_OwnershipDomain_15472876-1726-46ba-9f6b-bebc8849cdf9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_b8d4a582-64c0-407c-86f1-0c37120cd234" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_15472876-1726-46ba-9f6b-bebc8849cdf9" xlink:to="loc_srt_OwnershipDomain_b8d4a582-64c0-407c-86f1-0c37120cd234" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetGroupInc.Member_d374e589-ac01-430d-a7db-60eda07f754f" xlink:href="car-20250930.xsd#car_AvisBudgetGroupInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_b8d4a582-64c0-407c-86f1-0c37120cd234" xlink:to="loc_car_AvisBudgetGroupInc.Member_d374e589-ac01-430d-a7db-60eda07f754f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_4bb940ef-9816-4e4f-a81f-7e04bb72cb04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_547f2865-e2cc-4b55-85cc-c43c0d19f4b5" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_4bb940ef-9816-4e4f-a81f-7e04bb72cb04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_d488f153-ff23-410e-af4a-7be9373923ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_547f2865-e2cc-4b55-85cc-c43c0d19f4b5" xlink:to="loc_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_d488f153-ff23-410e-af4a-7be9373923ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_54443bbf-a284-4591-a15d-5570e4034162" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_547f2865-e2cc-4b55-85cc-c43c0d19f4b5" xlink:to="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_54443bbf-a284-4591-a15d-5570e4034162" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2fb12cd2-8a86-44e6-8e01-a334ba967078" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_547f2865-e2cc-4b55-85cc-c43c0d19f4b5" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2fb12cd2-8a86-44e6-8e01-a334ba967078" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_ccf52b20-5867-43ee-b812-c6c2b1e63589" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_547f2865-e2cc-4b55-85cc-c43c0d19f4b5" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_ccf52b20-5867-43ee-b812-c6c2b1e63589" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_dbec1ca1-f5cc-45c0-a83d-5b23cbe517bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_547f2865-e2cc-4b55-85cc-c43c0d19f4b5" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_dbec1ca1-f5cc-45c0-a83d-5b23cbe517bd" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/BasisofPresentationScheduleofDisaggregatedRevenueinBasisofPresentationDetails" xlink:type="simple" xlink:href="car-20250930.xsd#BasisofPresentationScheduleofDisaggregatedRevenueinBasisofPresentationDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/BasisofPresentationScheduleofDisaggregatedRevenueinBasisofPresentationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_de0a8b22-9665-4552-891c-8d9190ea341d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_8230c80a-2295-4690-b501-748392afca52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_de0a8b22-9665-4552-891c-8d9190ea341d" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_8230c80a-2295-4690-b501-748392afca52" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionAxis_be56c360-4c8b-4f11-8df9-7e7b85c523aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeographicDistributionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8230c80a-2295-4690-b501-748392afca52" xlink:to="loc_us-gaap_GeographicDistributionAxis_be56c360-4c8b-4f11-8df9-7e7b85c523aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_be56c360-4c8b-4f11-8df9-7e7b85c523aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeographicDistributionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GeographicDistributionAxis_be56c360-4c8b-4f11-8df9-7e7b85c523aa" xlink:to="loc_us-gaap_GeographicDistributionDomain_be56c360-4c8b-4f11-8df9-7e7b85c523aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_8c074202-6a26-4899-b859-4baedd573ab2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeographicDistributionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GeographicDistributionAxis_be56c360-4c8b-4f11-8df9-7e7b85c523aa" xlink:to="loc_us-gaap_GeographicDistributionDomain_8c074202-6a26-4899-b859-4baedd573ab2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_68c63e60-2af0-4882-9a84-abcd2d7ddebe" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeographicDistributionDomain_8c074202-6a26-4899-b859-4baedd573ab2" xlink:to="loc_srt_AmericasMember_68c63e60-2af0-4882-9a84-abcd2d7ddebe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_02716680-c87f-4233-b04d-aff0315f2c28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeographicDistributionDomain_8c074202-6a26-4899-b859-4baedd573ab2" xlink:to="loc_us-gaap_EMEAMember_02716680-c87f-4233-b04d-aff0315f2c28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AsiaAndAustralasiaMember_0429bf3e-7a3d-403a-8306-e501a0ece8bc" xlink:href="car-20250930.xsd#car_AsiaAndAustralasiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeographicDistributionDomain_8c074202-6a26-4899-b859-4baedd573ab2" xlink:to="loc_car_AsiaAndAustralasiaMember_0429bf3e-7a3d-403a-8306-e501a0ece8bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_0a498531-1b60-4505-a9d2-3985183354db" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8230c80a-2295-4690-b501-748392afca52" xlink:to="loc_srt_ProductOrServiceAxis_0a498531-1b60-4505-a9d2-3985183354db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_0a498531-1b60-4505-a9d2-3985183354db_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_0a498531-1b60-4505-a9d2-3985183354db" xlink:to="loc_srt_ProductsAndServicesDomain_0a498531-1b60-4505-a9d2-3985183354db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_108e382a-e433-4112-b169-e416e8cc75a5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_0a498531-1b60-4505-a9d2-3985183354db" xlink:to="loc_srt_ProductsAndServicesDomain_108e382a-e433-4112-b169-e416e8cc75a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisMember_1b223808-00fa-4ff7-bb16-c325ad667fd9" xlink:href="car-20250930.xsd#car_AvisMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_108e382a-e433-4112-b169-e416e8cc75a5" xlink:to="loc_car_AvisMember_1b223808-00fa-4ff7-bb16-c325ad667fd9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_BudgetMember_10f8a6e3-0b32-4a3d-af2c-9360160b9371" xlink:href="car-20250930.xsd#car_BudgetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_108e382a-e433-4112-b169-e416e8cc75a5" xlink:to="loc_car_BudgetMember_10f8a6e3-0b32-4a3d-af2c-9360160b9371" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_OtherBrandsMember_a94a258a-8b09-4721-b650-1f2fe218c439" xlink:href="car-20250930.xsd#car_OtherBrandsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_108e382a-e433-4112-b169-e416e8cc75a5" xlink:to="loc_car_OtherBrandsMember_a94a258a-8b09-4721-b650-1f2fe218c439" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_5707a19d-1e9d-41c8-86d9-4442fc5baf6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_de0a8b22-9665-4552-891c-8d9190ea341d" xlink:to="loc_us-gaap_Revenues_5707a19d-1e9d-41c8-86d9-4442fc5baf6c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/LeasesScheduleofRevenuesDisaggregatedbyGeographyDetails" xlink:type="simple" xlink:href="car-20250930.xsd#LeasesScheduleofRevenuesDisaggregatedbyGeographyDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/LeasesScheduleofRevenuesDisaggregatedbyGeographyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionLineItems_d68f0001-2d99-4db3-acb5-7e5bbe5e791a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionTable_ff537028-5fae-42f8-8b21-b9f04411a0c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_d68f0001-2d99-4db3-acb5-7e5bbe5e791a" xlink:to="loc_us-gaap_LessorLeaseDescriptionTable_ff537028-5fae-42f8-8b21-b9f04411a0c7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionAxis_8afdfed6-be22-40ac-a91c-af30ad773fb5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeographicDistributionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LessorLeaseDescriptionTable_ff537028-5fae-42f8-8b21-b9f04411a0c7" xlink:to="loc_us-gaap_GeographicDistributionAxis_8afdfed6-be22-40ac-a91c-af30ad773fb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_8afdfed6-be22-40ac-a91c-af30ad773fb5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeographicDistributionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GeographicDistributionAxis_8afdfed6-be22-40ac-a91c-af30ad773fb5" xlink:to="loc_us-gaap_GeographicDistributionDomain_8afdfed6-be22-40ac-a91c-af30ad773fb5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_6cebe714-ae75-4f5b-9c23-cf0a9b219ed8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeographicDistributionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GeographicDistributionAxis_8afdfed6-be22-40ac-a91c-af30ad773fb5" xlink:to="loc_us-gaap_GeographicDistributionDomain_6cebe714-ae75-4f5b-9c23-cf0a9b219ed8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_d2fc9633-a0ac-4ddc-8dec-9f2b2701f2e8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeographicDistributionDomain_6cebe714-ae75-4f5b-9c23-cf0a9b219ed8" xlink:to="loc_srt_AmericasMember_d2fc9633-a0ac-4ddc-8dec-9f2b2701f2e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_083d1fd3-7076-401c-8677-041d1dd2eab0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeographicDistributionDomain_6cebe714-ae75-4f5b-9c23-cf0a9b219ed8" xlink:to="loc_us-gaap_EMEAMember_083d1fd3-7076-401c-8677-041d1dd2eab0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AsiaAndAustralasiaMember_ca3a507f-a21c-4c6a-9a30-ea74f7e59f49" xlink:href="car-20250930.xsd#car_AsiaAndAustralasiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeographicDistributionDomain_6cebe714-ae75-4f5b-9c23-cf0a9b219ed8" xlink:to="loc_car_AsiaAndAustralasiaMember_ca3a507f-a21c-4c6a-9a30-ea74f7e59f49" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_40bb7ae4-e635-412b-ae16-88649b5332d9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LessorLeaseDescriptionTable_ff537028-5fae-42f8-8b21-b9f04411a0c7" xlink:to="loc_srt_ProductOrServiceAxis_40bb7ae4-e635-412b-ae16-88649b5332d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_40bb7ae4-e635-412b-ae16-88649b5332d9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_40bb7ae4-e635-412b-ae16-88649b5332d9" xlink:to="loc_srt_ProductsAndServicesDomain_40bb7ae4-e635-412b-ae16-88649b5332d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c1171c8a-5a38-4fca-85cb-9d162489835a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_40bb7ae4-e635-412b-ae16-88649b5332d9" xlink:to="loc_srt_ProductsAndServicesDomain_c1171c8a-5a38-4fca-85cb-9d162489835a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisMember_d13ed864-92b6-4858-bb58-887d7938b78d" xlink:href="car-20250930.xsd#car_AvisMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c1171c8a-5a38-4fca-85cb-9d162489835a" xlink:to="loc_car_AvisMember_d13ed864-92b6-4858-bb58-887d7938b78d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_BudgetMember_03bac214-56ea-41ef-8029-006004b99a48" xlink:href="car-20250930.xsd#car_BudgetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c1171c8a-5a38-4fca-85cb-9d162489835a" xlink:to="loc_car_BudgetMember_03bac214-56ea-41ef-8029-006004b99a48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_OtherBrandsMember_0807abfb-5508-4569-ae00-bd5952259931" xlink:href="car-20250930.xsd#car_OtherBrandsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c1171c8a-5a38-4fca-85cb-9d162489835a" xlink:to="loc_car_OtherBrandsMember_0807abfb-5508-4569-ae00-bd5952259931" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_0b515a12-e320-45fa-bfc1-ae7aabfccd03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLeaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_d68f0001-2d99-4db3-acb5-7e5bbe5e791a" xlink:to="loc_us-gaap_OperatingLeaseLeaseIncome_0b515a12-e320-45fa-bfc1-ae7aabfccd03" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/RestructuringandOtherRelatedChargesNarrativeDetails" xlink:type="simple" xlink:href="car-20250930.xsd#RestructuringandOtherRelatedChargesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/RestructuringandOtherRelatedChargesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_1a55c96f-b8a8-43ea-8371-dbbb5b637b6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_880a8d5c-51bd-48f8-b21a-8ac00aaf4fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1a55c96f-b8a8-43ea-8371-dbbb5b637b6e" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_880a8d5c-51bd-48f8-b21a-8ac00aaf4fe1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_5b61bb87-6775-432b-909d-af3e115f3fdc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_880a8d5c-51bd-48f8-b21a-8ac00aaf4fe1" xlink:to="loc_us-gaap_RestructuringPlanAxis_5b61bb87-6775-432b-909d-af3e115f3fdc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_5b61bb87-6775-432b-909d-af3e115f3fdc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_5b61bb87-6775-432b-909d-af3e115f3fdc" xlink:to="loc_us-gaap_RestructuringPlanDomain_5b61bb87-6775-432b-909d-af3e115f3fdc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_a3b0aab5-c53c-4ed2-b9ee-34d847000c29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_5b61bb87-6775-432b-909d-af3e115f3fdc" xlink:to="loc_us-gaap_RestructuringPlanDomain_a3b0aab5-c53c-4ed2-b9ee-34d847000c29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_GlobalRightsizingMember_642a5924-62f8-44e7-b4b4-4ebf6d61ffad" xlink:href="car-20250930.xsd#car_GlobalRightsizingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_a3b0aab5-c53c-4ed2-b9ee-34d847000c29" xlink:to="loc_car_GlobalRightsizingMember_642a5924-62f8-44e7-b4b4-4ebf6d61ffad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_7ac8b5ec-0a0b-49f7-9a24-b6cf18e60368" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_880a8d5c-51bd-48f8-b21a-8ac00aaf4fe1" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_7ac8b5ec-0a0b-49f7-9a24-b6cf18e60368" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_7ac8b5ec-0a0b-49f7-9a24-b6cf18e60368_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_7ac8b5ec-0a0b-49f7-9a24-b6cf18e60368" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_7ac8b5ec-0a0b-49f7-9a24-b6cf18e60368_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_99de54cd-6a5b-4197-b641-821f243f8a17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_7ac8b5ec-0a0b-49f7-9a24-b6cf18e60368" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_99de54cd-6a5b-4197-b641-821f243f8a17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_EmployeeSeparationMember_4dbe9e0b-98d1-451b-a918-4d6fcca1fe8c" xlink:href="car-20250930.xsd#car_EmployeeSeparationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_99de54cd-6a5b-4197-b641-821f243f8a17" xlink:to="loc_car_EmployeeSeparationMember_4dbe9e0b-98d1-451b-a918-4d6fcca1fe8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_5ea379cc-07fc-4975-a913-9f705acf0692" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1a55c96f-b8a8-43ea-8371-dbbb5b637b6e" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_5ea379cc-07fc-4975-a913-9f705acf0692" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_75796ba8-d4df-4028-9eb0-8419b2cd3f25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1a55c96f-b8a8-43ea-8371-dbbb5b637b6e" xlink:to="loc_us-gaap_RestructuringCharges_75796ba8-d4df-4028-9eb0-8419b2cd3f25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_1cb10957-aeac-472d-bbcc-04c03d145c67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1a55c96f-b8a8-43ea-8371-dbbb5b637b6e" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_1cb10957-aeac-472d-bbcc-04c03d145c67" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/RestructuringandOtherRelatedChargesScheduleofChangestoRestructuringRelatedLiabilitiesDetails" xlink:type="simple" xlink:href="car-20250930.xsd#RestructuringandOtherRelatedChargesScheduleofChangestoRestructuringRelatedLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/RestructuringandOtherRelatedChargesScheduleofChangestoRestructuringRelatedLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_050409f4-3a8d-4156-a3f6-276b1d546c45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_8afb3b81-add4-4c55-adf2-a4590a8c9c0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_050409f4-3a8d-4156-a3f6-276b1d546c45" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_8afb3b81-add4-4c55-adf2-a4590a8c9c0c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_b947c88f-c961-4c5c-9dbb-fb639af84492" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_8afb3b81-add4-4c55-adf2-a4590a8c9c0c" xlink:to="loc_us-gaap_RestructuringPlanAxis_b947c88f-c961-4c5c-9dbb-fb639af84492" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_b947c88f-c961-4c5c-9dbb-fb639af84492_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_b947c88f-c961-4c5c-9dbb-fb639af84492" xlink:to="loc_us-gaap_RestructuringPlanDomain_b947c88f-c961-4c5c-9dbb-fb639af84492_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_b3d2be94-77ff-43a7-8d4f-45434be4428a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_b947c88f-c961-4c5c-9dbb-fb639af84492" xlink:to="loc_us-gaap_RestructuringPlanDomain_b3d2be94-77ff-43a7-8d4f-45434be4428a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_GlobalRightsizingMember_29455dd7-18d7-487e-8bc3-77d9fa8b321b" xlink:href="car-20250930.xsd#car_GlobalRightsizingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_b3d2be94-77ff-43a7-8d4f-45434be4428a" xlink:to="loc_car_GlobalRightsizingMember_29455dd7-18d7-487e-8bc3-77d9fa8b321b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_CostOptimizationMember_fc44fa7e-adc2-432e-957e-37458adfcbf0" xlink:href="car-20250930.xsd#car_CostOptimizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_b3d2be94-77ff-43a7-8d4f-45434be4428a" xlink:to="loc_car_CostOptimizationMember_fc44fa7e-adc2-432e-957e-37458adfcbf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_691a9d39-42cd-43ea-aa83-bf4224e14e3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_8afb3b81-add4-4c55-adf2-a4590a8c9c0c" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_691a9d39-42cd-43ea-aa83-bf4224e14e3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_691a9d39-42cd-43ea-aa83-bf4224e14e3e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_691a9d39-42cd-43ea-aa83-bf4224e14e3e" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_691a9d39-42cd-43ea-aa83-bf4224e14e3e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_361bae5a-9e92-4585-aa2a-ab7fc7458f05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_691a9d39-42cd-43ea-aa83-bf4224e14e3e" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_361bae5a-9e92-4585-aa2a-ab7fc7458f05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_76a1451c-8b9f-4e75-874e-ec08b32c883e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_361bae5a-9e92-4585-aa2a-ab7fc7458f05" xlink:to="loc_us-gaap_EmployeeSeveranceMember_76a1451c-8b9f-4e75-874e-ec08b32c883e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FacilityClosingMember_3d87e6b8-d56a-46c5-a804-2fc62b3b479b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FacilityClosingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_361bae5a-9e92-4585-aa2a-ab7fc7458f05" xlink:to="loc_us-gaap_FacilityClosingMember_3d87e6b8-d56a-46c5-a804-2fc62b3b479b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_60815d34-2a2f-4ef2-9211-8a7ef6f951c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_361bae5a-9e92-4585-aa2a-ab7fc7458f05" xlink:to="loc_us-gaap_OtherRestructuringMember_60815d34-2a2f-4ef2-9211-8a7ef6f951c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_50f48c15-53a1-4290-84e0-ae1f3f99caaf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_8afb3b81-add4-4c55-adf2-a4590a8c9c0c" xlink:to="loc_srt_StatementGeographicalAxis_50f48c15-53a1-4290-84e0-ae1f3f99caaf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_50f48c15-53a1-4290-84e0-ae1f3f99caaf_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_50f48c15-53a1-4290-84e0-ae1f3f99caaf" xlink:to="loc_srt_SegmentGeographicalDomain_50f48c15-53a1-4290-84e0-ae1f3f99caaf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_52d0065d-d3a7-423c-8dfd-8d386ed35cdc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_50f48c15-53a1-4290-84e0-ae1f3f99caaf" xlink:to="loc_srt_SegmentGeographicalDomain_52d0065d-d3a7-423c-8dfd-8d386ed35cdc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_8b9e8991-eae6-49cd-8160-103ad332a12a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_52d0065d-d3a7-423c-8dfd-8d386ed35cdc" xlink:to="loc_srt_AmericasMember_8b9e8991-eae6-49cd-8160-103ad332a12a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_InternationalMember_dcd14ec8-9d62-494a-a51b-317038e6b283" xlink:href="car-20250930.xsd#car_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_52d0065d-d3a7-423c-8dfd-8d386ed35cdc" xlink:to="loc_car_InternationalMember_dcd14ec8-9d62-494a-a51b-317038e6b283" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_90ce04d6-c5fb-45a2-a516-1b997b8a32c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_050409f4-3a8d-4156-a3f6-276b1d546c45" xlink:to="loc_us-gaap_RestructuringReserveRollForward_90ce04d6-c5fb-45a2-a516-1b997b8a32c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_13ca1ac2-bc61-41e2-a683-b3b90fbc10a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_90ce04d6-c5fb-45a2-a516-1b997b8a32c1" xlink:to="loc_us-gaap_RestructuringReserve_13ca1ac2-bc61-41e2-a683-b3b90fbc10a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_8172f609-5f3e-442b-aa9f-d8ff0d18f4d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_90ce04d6-c5fb-45a2-a516-1b997b8a32c1" xlink:to="loc_us-gaap_RestructuringCharges_8172f609-5f3e-442b-aa9f-d8ff0d18f4d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_RestructuringAndRelatedCostPaymentsUtilization_6ec034bf-f96b-435a-bf8f-e8134b311930" xlink:href="car-20250930.xsd#car_RestructuringAndRelatedCostPaymentsUtilization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_90ce04d6-c5fb-45a2-a516-1b997b8a32c1" xlink:to="loc_car_RestructuringAndRelatedCostPaymentsUtilization_6ec034bf-f96b-435a-bf8f-e8134b311930" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_1fb08e45-6449-4a9a-9b5e-1d56de9f249b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/EarningsPerShareDetails" xlink:type="simple" xlink:href="car-20250930.xsd#EarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/EarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_0f069f7b-f554-4758-8448-7212c37e5484" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_13fc2a79-b1ee-48e2-a88f-940ab5a2b30e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_0f069f7b-f554-4758-8448-7212c37e5484" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_13fc2a79-b1ee-48e2-a88f-940ab5a2b30e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1cc8793d-0925-4afd-81d0-7ba14fdf682d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_13fc2a79-b1ee-48e2-a88f-940ab5a2b30e" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1cc8793d-0925-4afd-81d0-7ba14fdf682d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1cc8793d-0925-4afd-81d0-7ba14fdf682d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1cc8793d-0925-4afd-81d0-7ba14fdf682d" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1cc8793d-0925-4afd-81d0-7ba14fdf682d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_d9717bfa-62df-49a6-9cfc-ce204eb9a17b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1cc8793d-0925-4afd-81d0-7ba14fdf682d" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_d9717bfa-62df-49a6-9cfc-ce204eb9a17b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockCompensationPlanMember_be4293d7-9173-42de-bf03-b3a904a8753e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_d9717bfa-62df-49a6-9cfc-ce204eb9a17b" xlink:to="loc_us-gaap_StockCompensationPlanMember_be4293d7-9173-42de-bf03-b3a904a8753e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_1be769e6-865b-4565-9f49-6dae94f32234" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_0f069f7b-f554-4758-8448-7212c37e5484" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_1be769e6-865b-4565-9f49-6dae94f32234" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/IntangibleAssetsScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="car-20250930.xsd#IntangibleAssetsScheduleofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/IntangibleAssetsScheduleofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1c74b913-8ba0-46fa-a756-6bbf75630923" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_a1eeb2e3-94e8-404c-89c0-a4d571a2baa3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1c74b913-8ba0-46fa-a756-6bbf75630923" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_a1eeb2e3-94e8-404c-89c0-a4d571a2baa3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_33e4ddc0-c873-4d96-a67d-903d07bb14bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_a1eeb2e3-94e8-404c-89c0-a4d571a2baa3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_33e4ddc0-c873-4d96-a67d-903d07bb14bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_33e4ddc0-c873-4d96-a67d-903d07bb14bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_33e4ddc0-c873-4d96-a67d-903d07bb14bd" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_33e4ddc0-c873-4d96-a67d-903d07bb14bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9deeef14-3425-4340-bf32-cb76e59ca5e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_33e4ddc0-c873-4d96-a67d-903d07bb14bd" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9deeef14-3425-4340-bf32-cb76e59ca5e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_64184810-a74c-49de-8b21-6f5e3853d1c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9deeef14-3425-4340-bf32-cb76e59ca5e8" xlink:to="loc_us-gaap_LicensingAgreementsMember_64184810-a74c-49de-8b21-6f5e3853d1c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_f9f21aa8-c688-474e-a1bb-d1dec1f68584" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9deeef14-3425-4340-bf32-cb76e59ca5e8" xlink:to="loc_us-gaap_CustomerRelationshipsMember_f9f21aa8-c688-474e-a1bb-d1dec1f68584" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_c1cf16a0-381a-4112-af5d-fa519c15abe1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9deeef14-3425-4340-bf32-cb76e59ca5e8" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_c1cf16a0-381a-4112-af5d-fa519c15abe1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_6fbb2e4c-e809-4c60-9310-ebcff6debe6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1c74b913-8ba0-46fa-a756-6bbf75630923" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_6fbb2e4c-e809-4c60-9310-ebcff6debe6f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9a0eaa21-2af8-49be-bb6c-242d5d840a83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1c74b913-8ba0-46fa-a756-6bbf75630923" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9a0eaa21-2af8-49be-bb6c-242d5d840a83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bc7d8222-b478-40ce-8fa4-ae2a246fd0c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1c74b913-8ba0-46fa-a756-6bbf75630923" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_bc7d8222-b478-40ce-8fa4-ae2a246fd0c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_cb522be7-7e03-48cb-b137-f6e9b8e89a09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_25ef7e63-ba83-474e-bb75-8b235f6bddca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_cb522be7-7e03-48cb-b137-f6e9b8e89a09" xlink:to="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_25ef7e63-ba83-474e-bb75-8b235f6bddca" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_3b5a0810-460f-42b3-8f0f-e5800c0486c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_25ef7e63-ba83-474e-bb75-8b235f6bddca" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_3b5a0810-460f-42b3-8f0f-e5800c0486c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_3b5a0810-460f-42b3-8f0f-e5800c0486c4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_3b5a0810-460f-42b3-8f0f-e5800c0486c4" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_3b5a0810-460f-42b3-8f0f-e5800c0486c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_6e425709-a46b-4116-9682-8c2782998f92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_3b5a0810-460f-42b3-8f0f-e5800c0486c4" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_6e425709-a46b-4116-9682-8c2782998f92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_7768c93d-ccef-4ca4-8112-346fa3e833fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_6e425709-a46b-4116-9682-8c2782998f92" xlink:to="loc_us-gaap_TrademarksMember_7768c93d-ccef-4ca4-8112-346fa3e833fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_4e0688ba-8a78-4a08-ad10-f03cfaa0e0a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_cb522be7-7e03-48cb-b137-f6e9b8e89a09" xlink:to="loc_us-gaap_Goodwill_4e0688ba-8a78-4a08-ad10-f03cfaa0e0a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_d3730cfd-d07f-4e39-bcc6-1ad475ac1aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_cb522be7-7e03-48cb-b137-f6e9b8e89a09" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_d3730cfd-d07f-4e39-bcc6-1ad475ac1aa8" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/LongtermCorporateDebtandBorrowingArrangementsScheduleofLongTermDebtDetails" xlink:type="simple" xlink:href="car-20250930.xsd#LongtermCorporateDebtandBorrowingArrangementsScheduleofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/LongtermCorporateDebtandBorrowingArrangementsScheduleofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_48172161-5771-48bb-9e1b-154d3e43adf7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_DebtInstrumentTable_48172161-5771-48bb-9e1b-154d3e43adf7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_1c7e55af-f088-435f-9f84-f27477d1e648" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_48172161-5771-48bb-9e1b-154d3e43adf7" xlink:to="loc_us-gaap_DebtInstrumentAxis_1c7e55af-f088-435f-9f84-f27477d1e648" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1c7e55af-f088-435f-9f84-f27477d1e648_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_1c7e55af-f088-435f-9f84-f27477d1e648" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1c7e55af-f088-435f-9f84-f27477d1e648_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_1c7e55af-f088-435f-9f84-f27477d1e648" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_FivePointSevenFivePercentSeniorNotesDue2027Member_05e1db99-a4ab-4479-b3ef-0c85808afb60" xlink:href="car-20250930.xsd#car_FivePointSevenFivePercentSeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:to="loc_car_FivePointSevenFivePercentSeniorNotesDue2027Member_05e1db99-a4ab-4479-b3ef-0c85808afb60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_FourPointSevenFivePercentSeniorNotesDue2028Member_56b10385-4209-4b03-87ac-53f323a7e78e" xlink:href="car-20250930.xsd#car_FourPointSevenFivePercentSeniorNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:to="loc_car_FourPointSevenFivePercentSeniorNotesDue2028Member_56b10385-4209-4b03-87ac-53f323a7e78e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SevenPointPerentEuroDenominatedSeniorNotesDue2029Member_518013f2-bd33-4a3e-8560-816584b73734" xlink:href="car-20250930.xsd#car_SevenPointPerentEuroDenominatedSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:to="loc_car_SevenPointPerentEuroDenominatedSeniorNotesDue2029Member_518013f2-bd33-4a3e-8560-816584b73734" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_FivePointThreeSevenFivePercentSeniorNotesDue2029Member_1ea0eb05-4d83-477d-bdbf-73c6a8fc513e" xlink:href="car-20250930.xsd#car_FivePointThreeSevenFivePercentSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:to="loc_car_FivePointThreeSevenFivePercentSeniorNotesDue2029Member_1ea0eb05-4d83-477d-bdbf-73c6a8fc513e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_EightPointTwoFivePercentSeniorNotesDue2030Member_9eff9f69-f3c6-4d19-93bb-7221c8e5b857" xlink:href="car-20250930.xsd#car_EightPointTwoFivePercentSeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:to="loc_car_EightPointTwoFivePercentSeniorNotesDue2030Member_9eff9f69-f3c6-4d19-93bb-7221c8e5b857" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SevenPointTwoFiveEuroDenominatedSeniorNotesDue2030Member_1f2abdd4-f366-4a72-8ed9-0f4095533038" xlink:href="car-20250930.xsd#car_SevenPointTwoFiveEuroDenominatedSeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:to="loc_car_SevenPointTwoFiveEuroDenominatedSeniorNotesDue2030Member_1f2abdd4-f366-4a72-8ed9-0f4095533038" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_EightPointZeroPercentSeniorNotesDue2031Member_127fb44b-1a71-4d74-8e3a-e2f2ad2983f8" xlink:href="car-20250930.xsd#car_EightPointZeroPercentSeniorNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:to="loc_car_EightPointZeroPercentSeniorNotesDue2031Member_127fb44b-1a71-4d74-8e3a-e2f2ad2983f8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_EightPointThreeSevenFiveSeniorNotesDue2032Member_35b71be6-b16c-4439-af0c-6d58316f5c7f" xlink:href="car-20250930.xsd#car_EightPointThreeSevenFiveSeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:to="loc_car_EightPointThreeSevenFiveSeniorNotesDue2032Member_35b71be6-b16c-4439-af0c-6d58316f5c7f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_FloatingRateTermLoanDueJulyTwoThousandThirtyTwoMember_515ebb35-1570-4ac9-84bc-2a04e5e86ae3" xlink:href="car-20250930.xsd#car_FloatingRateTermLoanDueJulyTwoThousandThirtyTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d51df3b4-1d3c-4fb2-9f94-5813de37ef75" xlink:to="loc_car_FloatingRateTermLoanDueJulyTwoThousandThirtyTwoMember_515ebb35-1570-4ac9-84bc-2a04e5e86ae3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_ed7e54eb-84d0-4fbb-bdc2-e39875f713ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_48172161-5771-48bb-9e1b-154d3e43adf7" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_ed7e54eb-84d0-4fbb-bdc2-e39875f713ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ed7e54eb-84d0-4fbb-bdc2-e39875f713ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ed7e54eb-84d0-4fbb-bdc2-e39875f713ab" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ed7e54eb-84d0-4fbb-bdc2-e39875f713ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b463868f-03e3-4709-b613-d1eea2c90fe6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ed7e54eb-84d0-4fbb-bdc2-e39875f713ab" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b463868f-03e3-4709-b613-d1eea2c90fe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_8641c581-f0d8-489b-be00-9e38391af407" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b463868f-03e3-4709-b613-d1eea2c90fe6" xlink:to="loc_us-gaap_SeniorNotesMember_8641c581-f0d8-489b-be00-9e38391af407" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_26f887e7-72ff-4945-bd29-994bbad691a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b463868f-03e3-4709-b613-d1eea2c90fe6" xlink:to="loc_us-gaap_LoansPayableMember_26f887e7-72ff-4945-bd29-994bbad691a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_577b852e-2204-4fc2-9d08-a41bc8d11d19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_577b852e-2204-4fc2-9d08-a41bc8d11d19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_9f0c6323-dc1d-4a5d-964b-c04dd4b56d1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_9f0c6323-dc1d-4a5d-964b-c04dd4b56d1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt_16584628-54e2-4020-a6dc-19ab0d8583c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_OtherLongTermDebt_16584628-54e2-4020-a6dc-19ab0d8583c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_30f46965-66dc-4bf1-bf8b-a85fb6301154" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_30f46965-66dc-4bf1-bf8b-a85fb6301154" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_53a1ddde-7b15-4c2a-bb0c-094490940710" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_53a1ddde-7b15-4c2a-bb0c-094490940710" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_426a1918-7c3a-43c8-ae7f-5c928568d083" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_ShortTermBorrowings_426a1918-7c3a-43c8-ae7f-5c928568d083" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredLongTermDebt_8466392c-b143-465c-b405-56348b008feb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_SecuredLongTermDebt_8466392c-b143-465c-b405-56348b008feb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration_f5e4ff20-a978-4322-99ec-ee72d1e5b35d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration_f5e4ff20-a978-4322-99ec-ee72d1e5b35d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6d1dda3c-c07a-49c1-9c67-b9984aeb0c39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6d1dda3c-c07a-49c1-9c67-b9984aeb0c39" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_afc24718-59b2-4aa9-9754-05dcd66bd732" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_afc24718-59b2-4aa9-9754-05dcd66bd732" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAmountOfHedgedItem_0a1c48f6-e44a-409a-b379-5198dce0a3df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAmountOfHedgedItem"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_DerivativeAmountOfHedgedItem_0a1c48f6-e44a-409a-b379-5198dce0a3df" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_932df696-2050-462b-8846-835862cbb517" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7507db93-2fed-45d2-a042-74ef56e0ef95" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_932df696-2050-462b-8846-835862cbb517" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/LongtermCorporateDebtandBorrowingArrangementsNarrativeDetails" xlink:type="simple" xlink:href="car-20250930.xsd#LongtermCorporateDebtandBorrowingArrangementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/LongtermCorporateDebtandBorrowingArrangementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0bff0702-6ff4-4018-9b49-161434d151f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_bc7d535c-b269-4198-ac6a-d020e0071379" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bff0702-6ff4-4018-9b49-161434d151f3" xlink:to="loc_us-gaap_DebtInstrumentTable_bc7d535c-b269-4198-ac6a-d020e0071379" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_8c9ce21d-343c-4017-a61f-5a5c0ea5952b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_bc7d535c-b269-4198-ac6a-d020e0071379" xlink:to="loc_us-gaap_DebtInstrumentAxis_8c9ce21d-343c-4017-a61f-5a5c0ea5952b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_8c9ce21d-343c-4017-a61f-5a5c0ea5952b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_8c9ce21d-343c-4017-a61f-5a5c0ea5952b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_8c9ce21d-343c-4017-a61f-5a5c0ea5952b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ca3c92a5-afa2-4d84-852f-9f3cb0740c23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_8c9ce21d-343c-4017-a61f-5a5c0ea5952b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ca3c92a5-afa2-4d84-852f-9f3cb0740c23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_FloatingRateTermLoanDueDecemberTwoThousandTwentyFiveMember_08bcb7fe-a7f2-4263-80a2-9c80cadef6b4" xlink:href="car-20250930.xsd#car_FloatingRateTermLoanDueDecemberTwoThousandTwentyFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ca3c92a5-afa2-4d84-852f-9f3cb0740c23" xlink:to="loc_car_FloatingRateTermLoanDueDecemberTwoThousandTwentyFiveMember_08bcb7fe-a7f2-4263-80a2-9c80cadef6b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_EightPointThreeSevenFiveSeniorNotesDue2032Member_81a50c85-4590-44dc-8e8a-b50171b49fe6" xlink:href="car-20250930.xsd#car_EightPointThreeSevenFiveSeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ca3c92a5-afa2-4d84-852f-9f3cb0740c23" xlink:to="loc_car_EightPointThreeSevenFiveSeniorNotesDue2032Member_81a50c85-4590-44dc-8e8a-b50171b49fe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_FivePointSevenFivePercentSeniorNotesDue2027Member_1ecd6ee0-db4f-49f1-854c-d526a27043b7" xlink:href="car-20250930.xsd#car_FivePointSevenFivePercentSeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ca3c92a5-afa2-4d84-852f-9f3cb0740c23" xlink:to="loc_car_FivePointSevenFivePercentSeniorNotesDue2027Member_1ecd6ee0-db4f-49f1-854c-d526a27043b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_FloatingRateTermLoanDueJulyTwoThousandThirtyTwoMember_ae2dc0e6-49e8-47e5-8aa5-91383131240b" xlink:href="car-20250930.xsd#car_FloatingRateTermLoanDueJulyTwoThousandThirtyTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ca3c92a5-afa2-4d84-852f-9f3cb0740c23" xlink:to="loc_car_FloatingRateTermLoanDueJulyTwoThousandThirtyTwoMember_ae2dc0e6-49e8-47e5-8aa5-91383131240b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_be45837a-534d-4d2a-be67-732179a017b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_bc7d535c-b269-4198-ac6a-d020e0071379" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_be45837a-534d-4d2a-be67-732179a017b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_be45837a-534d-4d2a-be67-732179a017b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_be45837a-534d-4d2a-be67-732179a017b8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_be45837a-534d-4d2a-be67-732179a017b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_59ce3c11-03ea-4a87-857a-1c40d61ff58c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_be45837a-534d-4d2a-be67-732179a017b8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_59ce3c11-03ea-4a87-857a-1c40d61ff58c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_73a306ba-a614-4bb4-89ca-7b6e38b24e54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_59ce3c11-03ea-4a87-857a-1c40d61ff58c" xlink:to="loc_us-gaap_LoansPayableMember_73a306ba-a614-4bb4-89ca-7b6e38b24e54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_e34f8afb-ef4c-4f2a-9aa9-070062babd01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_59ce3c11-03ea-4a87-857a-1c40d61ff58c" xlink:to="loc_us-gaap_SeniorNotesMember_e34f8afb-ef4c-4f2a-9aa9-070062babd01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_68217470-9675-4db6-b7ca-5c2d351cc65f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_59ce3c11-03ea-4a87-857a-1c40d61ff58c" xlink:to="loc_us-gaap_LineOfCreditMember_68217470-9675-4db6-b7ca-5c2d351cc65f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_5f846fad-70f0-4d00-89ab-dad8f7127d89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_bc7d535c-b269-4198-ac6a-d020e0071379" xlink:to="loc_us-gaap_CreditFacilityAxis_5f846fad-70f0-4d00-89ab-dad8f7127d89" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_5f846fad-70f0-4d00-89ab-dad8f7127d89_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_5f846fad-70f0-4d00-89ab-dad8f7127d89" xlink:to="loc_us-gaap_CreditFacilityDomain_5f846fad-70f0-4d00-89ab-dad8f7127d89_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1fa7ded8-6b48-4170-9678-c8edf68dfc87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_5f846fad-70f0-4d00-89ab-dad8f7127d89" xlink:to="loc_us-gaap_CreditFacilityDomain_1fa7ded8-6b48-4170-9678-c8edf68dfc87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SBLCFacilityMember_047c9aa4-96d6-4e9c-ac6c-d65bb99f439b" xlink:href="car-20250930.xsd#car_SBLCFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_1fa7ded8-6b48-4170-9678-c8edf68dfc87" xlink:to="loc_car_SBLCFacilityMember_047c9aa4-96d6-4e9c-ac6c-d65bb99f439b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_a281c3a9-dc78-484b-b93d-dd7c2d152aa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bff0702-6ff4-4018-9b49-161434d151f3" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_a281c3a9-dc78-484b-b93d-dd7c2d152aa1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_6e7251a7-df22-4f26-b587-17bb2280037c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bff0702-6ff4-4018-9b49-161434d151f3" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_6e7251a7-df22-4f26-b587-17bb2280037c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a7e28598-c489-477c-9e38-d287467cef1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bff0702-6ff4-4018-9b49-161434d151f3" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a7e28598-c489-477c-9e38-d287467cef1f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchaseAmount_4c7c4d97-0d8a-4799-8d8b-a31713a58b15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRepurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bff0702-6ff4-4018-9b49-161434d151f3" xlink:to="loc_us-gaap_DebtInstrumentRepurchaseAmount_4c7c4d97-0d8a-4799-8d8b-a31713a58b15" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_e419ab46-a4ab-4ec3-ba5f-929ad60ee83c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bff0702-6ff4-4018-9b49-161434d151f3" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_e419ab46-a4ab-4ec3-ba5f-929ad60ee83c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_0ee9796e-5dcb-415f-94de-54fe424eb534" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bff0702-6ff4-4018-9b49-161434d151f3" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_0ee9796e-5dcb-415f-94de-54fe424eb534" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_496d6e2b-66f2-49a0-abb3-3565280df76b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bff0702-6ff4-4018-9b49-161434d151f3" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_496d6e2b-66f2-49a0-abb3-3565280df76b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_aa9f68ce-a64f-4ce0-b59d-4fec7a231d63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bff0702-6ff4-4018-9b49-161434d151f3" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_aa9f68ce-a64f-4ce0-b59d-4fec7a231d63" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/LongtermCorporateDebtandBorrowingArrangementsScheduleofCommittedCreditFacilitiesDetails" xlink:type="simple" xlink:href="car-20250930.xsd#LongtermCorporateDebtandBorrowingArrangementsScheduleofCommittedCreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/LongtermCorporateDebtandBorrowingArrangementsScheduleofCommittedCreditFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_5c1bf6de-dab0-41f8-bc83-e4bec8d2d8f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_e31410ee-1fb3-4162-bddf-b50770cb60b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_5c1bf6de-dab0-41f8-bc83-e4bec8d2d8f7" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_e31410ee-1fb3-4162-bddf-b50770cb60b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_b985b7d1-d226-467c-8eb4-e600cb88d958" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_e31410ee-1fb3-4162-bddf-b50770cb60b4" xlink:to="loc_us-gaap_CreditFacilityAxis_b985b7d1-d226-467c-8eb4-e600cb88d958" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_b985b7d1-d226-467c-8eb4-e600cb88d958_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_b985b7d1-d226-467c-8eb4-e600cb88d958" xlink:to="loc_us-gaap_CreditFacilityDomain_b985b7d1-d226-467c-8eb4-e600cb88d958_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_250e39fd-f0e1-4728-b3d3-7114c3db9d63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_b985b7d1-d226-467c-8eb4-e600cb88d958" xlink:to="loc_us-gaap_CreditFacilityDomain_250e39fd-f0e1-4728-b3d3-7114c3db9d63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_d46cca4c-b011-452d-ae60-3d16e2751580" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_250e39fd-f0e1-4728-b3d3-7114c3db9d63" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_d46cca4c-b011-452d-ae60-3d16e2751580" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_db0883f2-a03e-45e5-a04f-0f1425048224" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_e31410ee-1fb3-4162-bddf-b50770cb60b4" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_db0883f2-a03e-45e5-a04f-0f1425048224" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_db0883f2-a03e-45e5-a04f-0f1425048224_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_db0883f2-a03e-45e5-a04f-0f1425048224" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_db0883f2-a03e-45e5-a04f-0f1425048224_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_dd91bf8b-05cb-410f-bf43-6f9e9e501f0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_db0883f2-a03e-45e5-a04f-0f1425048224" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_dd91bf8b-05cb-410f-bf43-6f9e9e501f0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_b81c136e-9ee8-4c84-94d3-f0b8525136f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_dd91bf8b-05cb-410f-bf43-6f9e9e501f0d" xlink:to="loc_us-gaap_LineOfCreditMember_b81c136e-9ee8-4c84-94d3-f0b8525136f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_2a839281-7fd6-49a1-b868-48f700907a8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_5c1bf6de-dab0-41f8-bc83-e4bec8d2d8f7" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_2a839281-7fd6-49a1-b868-48f700907a8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_07b78882-50b7-4d60-9e05-e0d2ff56910b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_5c1bf6de-dab0-41f8-bc83-e4bec8d2d8f7" xlink:to="loc_us-gaap_LineOfCredit_07b78882-50b7-4d60-9e05-e0d2ff56910b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_02076509-d599-494c-9ad3-1a380f43fdaf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_5c1bf6de-dab0-41f8-bc83-e4bec8d2d8f7" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_02076509-d599-494c-9ad3-1a380f43fdaf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_f95c8f22-cf90-431d-a794-13b9ca2bc60a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_5c1bf6de-dab0-41f8-bc83-e4bec8d2d8f7" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_f95c8f22-cf90-431d-a794-13b9ca2bc60a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration_6192910e-b1fa-4dd1-bd1c-2846818ea382" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_5c1bf6de-dab0-41f8-bc83-e4bec8d2d8f7" xlink:to="loc_us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration_6192910e-b1fa-4dd1-bd1c-2846818ea382" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_2aa8baa3-5264-437a-9635-6a0f4cc17a43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_5c1bf6de-dab0-41f8-bc83-e4bec8d2d8f7" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_2aa8baa3-5264-437a-9635-6a0f4cc17a43" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofDebtUnderVehicleProgramsDetails" xlink:type="simple" xlink:href="car-20250930.xsd#DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofDebtUnderVehicleProgramsDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofDebtUnderVehicleProgramsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_eed4bdc7-51f3-4f3d-b9d7-d6a927742644" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_1e459f34-1316-4b0f-adf6-134b6bf85280" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_eed4bdc7-51f3-4f3d-b9d7-d6a927742644" xlink:to="loc_us-gaap_DebtInstrumentTable_1e459f34-1316-4b0f-adf6-134b6bf85280" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_2c08ae03-e69f-4463-a21e-f3742f442351" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1e459f34-1316-4b0f-adf6-134b6bf85280" xlink:to="loc_srt_CounterpartyNameAxis_2c08ae03-e69f-4463-a21e-f3742f442351" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_2c08ae03-e69f-4463-a21e-f3742f442351_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_2c08ae03-e69f-4463-a21e-f3742f442351" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_2c08ae03-e69f-4463-a21e-f3742f442351_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_828349ea-27db-4db6-857d-da2a7e35c9be" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_2c08ae03-e69f-4463-a21e-f3742f442351" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_828349ea-27db-4db6-857d-da2a7e35c9be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingMember_c7ce2036-8814-4101-88e1-ef6252df254e" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_828349ea-27db-4db6-857d-da2a7e35c9be" xlink:to="loc_car_AvisBudgetRentalCarFundingMember_c7ce2036-8814-4101-88e1-ef6252df254e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e32781d6-2be5-4792-8b35-e89c6bacaf82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1e459f34-1316-4b0f-adf6-134b6bf85280" xlink:to="loc_us-gaap_DebtInstrumentAxis_e32781d6-2be5-4792-8b35-e89c6bacaf82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e32781d6-2be5-4792-8b35-e89c6bacaf82_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_e32781d6-2be5-4792-8b35-e89c6bacaf82" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e32781d6-2be5-4792-8b35-e89c6bacaf82_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_2c5f1b46-6842-493c-8f48-31c8a44083f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_e32781d6-2be5-4792-8b35-e89c6bacaf82" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_2c5f1b46-6842-493c-8f48-31c8a44083f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_DebtDueToRentalCarFundingMember_006b160a-4f28-4234-90c2-2cdffd659e15" xlink:href="car-20250930.xsd#car_DebtDueToRentalCarFundingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2c5f1b46-6842-493c-8f48-31c8a44083f7" xlink:to="loc_car_DebtDueToRentalCarFundingMember_006b160a-4f28-4234-90c2-2cdffd659e15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_DebtDueToRentalCarFundingClassRNotesMember_1d5dc7f9-ac2c-40ff-b219-9a665198a658" xlink:href="car-20250930.xsd#car_DebtDueToRentalCarFundingClassRNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_DebtDueToRentalCarFundingMember_006b160a-4f28-4234-90c2-2cdffd659e15" xlink:to="loc_car_DebtDueToRentalCarFundingClassRNotesMember_1d5dc7f9-ac2c-40ff-b219-9a665198a658" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AmericasDebtBorrowingsMember_80423426-131c-46b2-9ed8-34f5efc77885" xlink:href="car-20250930.xsd#car_AmericasDebtBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2c5f1b46-6842-493c-8f48-31c8a44083f7" xlink:to="loc_car_AmericasDebtBorrowingsMember_80423426-131c-46b2-9ed8-34f5efc77885" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_InternationalDebtBorrowingsMember_89ff18c5-eddf-4e53-86c3-b27caf88a18e" xlink:href="car-20250930.xsd#car_InternationalDebtBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2c5f1b46-6842-493c-8f48-31c8a44083f7" xlink:to="loc_car_InternationalDebtBorrowingsMember_89ff18c5-eddf-4e53-86c3-b27caf88a18e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_InternationalCapitalLeasesMember_651d04f3-f0a8-4b2b-a0cc-91674f0e08c1" xlink:href="car-20250930.xsd#car_InternationalCapitalLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2c5f1b46-6842-493c-8f48-31c8a44083f7" xlink:to="loc_car_InternationalCapitalLeasesMember_651d04f3-f0a8-4b2b-a0cc-91674f0e08c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_OtherDebtUnderVehicleProgramMember_3c95052b-fc7c-465b-bbc0-65ca9330779f" xlink:href="car-20250930.xsd#car_OtherDebtUnderVehicleProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2c5f1b46-6842-493c-8f48-31c8a44083f7" xlink:to="loc_car_OtherDebtUnderVehicleProgramMember_3c95052b-fc7c-465b-bbc0-65ca9330779f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_VehicleProgramsMember_d1196334-e709-4812-a18b-1d36eb0c0fbe" xlink:href="car-20250930.xsd#car_VehicleProgramsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2c5f1b46-6842-493c-8f48-31c8a44083f7" xlink:to="loc_car_VehicleProgramsMember_d1196334-e709-4812-a18b-1d36eb0c0fbe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_VehicleProgramOutstandingDebt_273ef239-390f-43e5-aca2-0bf80ad1cbbb" xlink:href="car-20250930.xsd#car_VehicleProgramOutstandingDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_eed4bdc7-51f3-4f3d-b9d7-d6a927742644" xlink:to="loc_car_VehicleProgramOutstandingDebt_273ef239-390f-43e5-aca2-0bf80ad1cbbb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_VehicleProgramOutstandingDebtDeferredFinanceCostsNet_60d7e839-ded7-47fa-9269-c642b4529a4c" xlink:href="car-20250930.xsd#car_VehicleProgramOutstandingDebtDeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_eed4bdc7-51f3-4f3d-b9d7-d6a927742644" xlink:to="loc_car_VehicleProgramOutstandingDebtDeferredFinanceCostsNet_60d7e839-ded7-47fa-9269-c642b4529a4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_438778e3-b462-4571-af6e-49674efd7d30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_eed4bdc7-51f3-4f3d-b9d7-d6a927742644" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_438778e3-b462-4571-af6e-49674efd7d30" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofDebtIssuedbyAESOPDetails" xlink:type="simple" xlink:href="car-20250930.xsd#DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofDebtIssuedbyAESOPDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofDebtIssuedbyAESOPDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_c8a9a839-f279-40a6-9a15-d1dacc955e63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_5068cda5-3aa4-4fb2-b342-6be40f1971b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c8a9a839-f279-40a6-9a15-d1dacc955e63" xlink:to="loc_us-gaap_DebtInstrumentTable_5068cda5-3aa4-4fb2-b342-6be40f1971b7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_50e42e64-f50c-41f3-b2a2-7e28ac4fbf0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5068cda5-3aa4-4fb2-b342-6be40f1971b7" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_50e42e64-f50c-41f3-b2a2-7e28ac4fbf0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_50e42e64-f50c-41f3-b2a2-7e28ac4fbf0a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_50e42e64-f50c-41f3-b2a2-7e28ac4fbf0a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_50e42e64-f50c-41f3-b2a2-7e28ac4fbf0a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_50e42e64-f50c-41f3-b2a2-7e28ac4fbf0a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingProgramAugust2027Member_cad7887f-788a-46b8-aad4-5126ef7d2d99" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingProgramAugust2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:to="loc_car_AvisBudgetRentalCarFundingProgramAugust2027Member_cad7887f-788a-46b8-aad4-5126ef7d2d99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingProgramApril2028Member_b7911eda-037a-49f5-b97e-d51579a4eb28" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingProgramApril2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:to="loc_car_AvisBudgetRentalCarFundingProgramApril2028Member_b7911eda-037a-49f5-b97e-d51579a4eb28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingProgramJune2028Member_bfe922dd-f3ea-49c8-b2b7-a2b9f2b080ce" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingProgramJune2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:to="loc_car_AvisBudgetRentalCarFundingProgramJune2028Member_bfe922dd-f3ea-49c8-b2b7-a2b9f2b080ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingProgramDecember2028Member_27554a51-383e-41a9-a046-cf8b0bdd650b" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingProgramDecember2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:to="loc_car_AvisBudgetRentalCarFundingProgramDecember2028Member_27554a51-383e-41a9-a046-cf8b0bdd650b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingProgramFebruary2029Member_7e53e5a7-a8fe-4491-bf6e-055f403b8ebd" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingProgramFebruary2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:to="loc_car_AvisBudgetRentalCarFundingProgramFebruary2029Member_7e53e5a7-a8fe-4491-bf6e-055f403b8ebd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingProgramAugust2028Member_a45f54da-8273-4ba0-81a5-1b7564e31793" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingProgramAugust2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:to="loc_car_AvisBudgetRentalCarFundingProgramAugust2028Member_a45f54da-8273-4ba0-81a5-1b7564e31793" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingProgramAugust2030Member_61c9d630-4047-4850-9600-21596cd11e65" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingProgramAugust2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:to="loc_car_AvisBudgetRentalCarFundingProgramAugust2030Member_61c9d630-4047-4850-9600-21596cd11e65" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingProgramFebruary20291Member_cef6b429-0316-4ba9-b57a-a665fe35ca88" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingProgramFebruary20291Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:to="loc_car_AvisBudgetRentalCarFundingProgramFebruary20291Member_cef6b429-0316-4ba9-b57a-a665fe35ca88" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingProgramFebruary2031Member_2c977c90-e220-4b13-9e2f-867e0e209ede" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingProgramFebruary2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_d257711e-2ec9-4211-92a7-6d8e2b386220" xlink:to="loc_car_AvisBudgetRentalCarFundingProgramFebruary2031Member_2c977c90-e220-4b13-9e2f-867e0e209ede" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_e89c47ef-9ab3-4ff1-b865-24c9140f8718" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c8a9a839-f279-40a6-9a15-d1dacc955e63" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_e89c47ef-9ab3-4ff1-b865-24c9140f8718" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesAtCarryingValue_4a43b534-452d-41e1-a08a-df9c89b72c45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c8a9a839-f279-40a6-9a15-d1dacc955e63" xlink:to="loc_us-gaap_AssetBackedSecuritiesAtCarryingValue_4a43b534-452d-41e1-a08a-df9c89b72c45" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/DebtUnderVehicleProgramsandBorrowingArrangementsNarrativeDetails" xlink:type="simple" xlink:href="car-20250930.xsd#DebtUnderVehicleProgramsandBorrowingArrangementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/DebtUnderVehicleProgramsandBorrowingArrangementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_55a7c8e4-d44d-45ec-9825-8eaa02e2c6b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_ab280c18-9729-4cdb-8fef-15a250c499b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_55a7c8e4-d44d-45ec-9825-8eaa02e2c6b6" xlink:to="loc_us-gaap_DebtInstrumentTable_ab280c18-9729-4cdb-8fef-15a250c499b8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_cdd18f04-4634-4e7e-a684-4d4fcc516973" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ab280c18-9729-4cdb-8fef-15a250c499b8" xlink:to="loc_us-gaap_DebtInstrumentAxis_cdd18f04-4634-4e7e-a684-4d4fcc516973" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cdd18f04-4634-4e7e-a684-4d4fcc516973_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_cdd18f04-4634-4e7e-a684-4d4fcc516973" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cdd18f04-4634-4e7e-a684-4d4fcc516973_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1bc53f51-cf5f-442b-ad34-718ef1c313b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_cdd18f04-4634-4e7e-a684-4d4fcc516973" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1bc53f51-cf5f-442b-ad34-718ef1c313b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_RepurchaseFacilityMember_9a3b1226-d833-45db-842f-dc098ccaca42" xlink:href="car-20250930.xsd#car_RepurchaseFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1bc53f51-cf5f-442b-ad34-718ef1c313b2" xlink:to="loc_car_RepurchaseFacilityMember_9a3b1226-d833-45db-842f-dc098ccaca42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SecondRepurchaseFacilityMember_a5761723-132a-4ba4-90c7-58fcd9632ddd" xlink:href="car-20250930.xsd#car_SecondRepurchaseFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1bc53f51-cf5f-442b-ad34-718ef1c313b2" xlink:to="loc_car_SecondRepurchaseFacilityMember_a5761723-132a-4ba4-90c7-58fcd9632ddd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_DebtInstrumentNumberOfRepurchaseAgreements_695c5fb5-46ea-4871-b795-5821f0178613" xlink:href="car-20250930.xsd#car_DebtInstrumentNumberOfRepurchaseAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_55a7c8e4-d44d-45ec-9825-8eaa02e2c6b6" xlink:to="loc_car_DebtInstrumentNumberOfRepurchaseAgreements_695c5fb5-46ea-4871-b795-5821f0178613" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_DebtInterestTenorPeriod_cadfb5ea-912f-48d4-bf1b-c892e0b771f3" xlink:href="car-20250930.xsd#car_DebtInterestTenorPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_55a7c8e4-d44d-45ec-9825-8eaa02e2c6b6" xlink:to="loc_car_DebtInterestTenorPeriod_cadfb5ea-912f-48d4-bf1b-c892e0b771f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_VehicleProgramOutstandingDebt_622803cd-eb68-450d-b78c-142d355d4e5c" xlink:href="car-20250930.xsd#car_VehicleProgramOutstandingDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_55a7c8e4-d44d-45ec-9825-8eaa02e2c6b6" xlink:to="loc_car_VehicleProgramOutstandingDebt_622803cd-eb68-450d-b78c-142d355d4e5c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_5ddab3de-55d4-4037-b111-25e69de1f369" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_55a7c8e4-d44d-45ec-9825-8eaa02e2c6b6" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_5ddab3de-55d4-4037-b111-25e69de1f369" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCollateralAmount_ad21dadd-03d5-4717-9667-521639ab5b3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCollateralAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_55a7c8e4-d44d-45ec-9825-8eaa02e2c6b6" xlink:to="loc_us-gaap_DebtInstrumentCollateralAmount_ad21dadd-03d5-4717-9667-521639ab5b3f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofContractualMaturitiesDetails" xlink:type="simple" xlink:href="car-20250930.xsd#DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofContractualMaturitiesDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofContractualMaturitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_ebf8c6a9-699e-4007-8d60-221417d8aa19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_97bd7dde-cf08-45f4-a9cc-760553756e04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ebf8c6a9-699e-4007-8d60-221417d8aa19" xlink:to="loc_us-gaap_DebtInstrumentTable_97bd7dde-cf08-45f4-a9cc-760553756e04" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_fd0c1a95-adb4-4827-8a41-716f1c3c99a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_97bd7dde-cf08-45f4-a9cc-760553756e04" xlink:to="loc_us-gaap_DebtInstrumentAxis_fd0c1a95-adb4-4827-8a41-716f1c3c99a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_fd0c1a95-adb4-4827-8a41-716f1c3c99a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_fd0c1a95-adb4-4827-8a41-716f1c3c99a1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_fd0c1a95-adb4-4827-8a41-716f1c3c99a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a8fde083-66ac-44b7-82cc-6fa98fc828ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_fd0c1a95-adb4-4827-8a41-716f1c3c99a1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a8fde083-66ac-44b7-82cc-6fa98fc828ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_VehicleProgramsMember_978948b7-de43-4a83-9b6a-eb93a9362fe6" xlink:href="car-20250930.xsd#car_VehicleProgramsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a8fde083-66ac-44b7-82cc-6fa98fc828ce" xlink:to="loc_car_VehicleProgramsMember_978948b7-de43-4a83-9b6a-eb93a9362fe6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_51cb7b4f-367e-474e-8a11-2f2b0e8db0ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_97bd7dde-cf08-45f4-a9cc-760553756e04" xlink:to="loc_us-gaap_CreditFacilityAxis_51cb7b4f-367e-474e-8a11-2f2b0e8db0ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_51cb7b4f-367e-474e-8a11-2f2b0e8db0ce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_51cb7b4f-367e-474e-8a11-2f2b0e8db0ce" xlink:to="loc_us-gaap_CreditFacilityDomain_51cb7b4f-367e-474e-8a11-2f2b0e8db0ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_af19c3ff-4b49-41c8-afa8-21d687532c7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_51cb7b4f-367e-474e-8a11-2f2b0e8db0ce" xlink:to="loc_us-gaap_CreditFacilityDomain_af19c3ff-4b49-41c8-afa8-21d687532c7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_BankAndBankSponsoredFacilitiesMember_7e2ea7dc-07c6-489e-a8a8-93fabe586a3e" xlink:href="car-20250930.xsd#car_BankAndBankSponsoredFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_af19c3ff-4b49-41c8-afa8-21d687532c7c" xlink:to="loc_car_BankAndBankSponsoredFacilitiesMember_7e2ea7dc-07c6-489e-a8a8-93fabe586a3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_08da8e55-9869-4295-8a05-87ba7e64a9ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ebf8c6a9-699e-4007-8d60-221417d8aa19" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_08da8e55-9869-4295-8a05-87ba7e64a9ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_3fb8eabb-ce0b-4adc-91a1-1fb2ee09109f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ebf8c6a9-699e-4007-8d60-221417d8aa19" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_3fb8eabb-ce0b-4adc-91a1-1fb2ee09109f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_20e6a307-81d3-45bc-9cdd-946d8e2c333e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ebf8c6a9-699e-4007-8d60-221417d8aa19" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_20e6a307-81d3-45bc-9cdd-946d8e2c333e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_f4ee0180-048f-49a4-bda7-26e23a747f00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ebf8c6a9-699e-4007-8d60-221417d8aa19" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_f4ee0180-048f-49a4-bda7-26e23a747f00" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_99c5d2a9-5f99-4d22-90df-8ff4659808bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ebf8c6a9-699e-4007-8d60-221417d8aa19" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_99c5d2a9-5f99-4d22-90df-8ff4659808bd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_LongTermDebtMaturityAfterYearFour_fde33799-2ab1-4766-9470-edac452b5e2f" xlink:href="car-20250930.xsd#car_LongTermDebtMaturityAfterYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ebf8c6a9-699e-4007-8d60-221417d8aa19" xlink:to="loc_car_LongTermDebtMaturityAfterYearFour_fde33799-2ab1-4766-9470-edac452b5e2f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_aafb3cff-6941-4b64-86a7-49bc96368bcf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ebf8c6a9-699e-4007-8d60-221417d8aa19" xlink:to="loc_us-gaap_LongTermDebt_aafb3cff-6941-4b64-86a7-49bc96368bcf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_eec445d8-af5d-4bd0-866e-8804230b51ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ebf8c6a9-699e-4007-8d60-221417d8aa19" xlink:to="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_eec445d8-af5d-4bd0-866e-8804230b51ad" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofAvailableFundingUndertheVehicleProgramsDetails" xlink:type="simple" xlink:href="car-20250930.xsd#DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofAvailableFundingUndertheVehicleProgramsDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/DebtUnderVehicleProgramsandBorrowingArrangementsScheduleofAvailableFundingUndertheVehicleProgramsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_f3c5d999-8c01-48a0-97e4-935a6afe2e37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_d111e42d-fae8-417d-a1fd-0d429a536b07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f3c5d999-8c01-48a0-97e4-935a6afe2e37" xlink:to="loc_us-gaap_DebtInstrumentTable_d111e42d-fae8-417d-a1fd-0d429a536b07" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_d1d42f0e-1e7e-4cf3-85f5-d62d042ad7dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d111e42d-fae8-417d-a1fd-0d429a536b07" xlink:to="loc_us-gaap_DebtInstrumentAxis_d1d42f0e-1e7e-4cf3-85f5-d62d042ad7dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d1d42f0e-1e7e-4cf3-85f5-d62d042ad7dd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_d1d42f0e-1e7e-4cf3-85f5-d62d042ad7dd" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d1d42f0e-1e7e-4cf3-85f5-d62d042ad7dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_71ebea13-1210-453a-b72d-87805e1244b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_d1d42f0e-1e7e-4cf3-85f5-d62d042ad7dd" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_71ebea13-1210-453a-b72d-87805e1244b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_DebtDueToRentalCarFundingMember_e96abae1-40a1-43f2-bba3-f980519d0c1d" xlink:href="car-20250930.xsd#car_DebtDueToRentalCarFundingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_71ebea13-1210-453a-b72d-87805e1244b0" xlink:to="loc_car_DebtDueToRentalCarFundingMember_e96abae1-40a1-43f2-bba3-f980519d0c1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AmericasDebtBorrowingsMember_d1a1b2a6-275f-4c1f-a619-0ede89db09d9" xlink:href="car-20250930.xsd#car_AmericasDebtBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_71ebea13-1210-453a-b72d-87805e1244b0" xlink:to="loc_car_AmericasDebtBorrowingsMember_d1a1b2a6-275f-4c1f-a619-0ede89db09d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_InternationalDebtBorrowingsMember_815621fe-1358-4073-bd3c-578b8389f574" xlink:href="car-20250930.xsd#car_InternationalDebtBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_71ebea13-1210-453a-b72d-87805e1244b0" xlink:to="loc_car_InternationalDebtBorrowingsMember_815621fe-1358-4073-bd3c-578b8389f574" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_InternationalCapitalLeasesMember_2cd635e1-7a69-47cc-93b7-4b506a0a3a5d" xlink:href="car-20250930.xsd#car_InternationalCapitalLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_71ebea13-1210-453a-b72d-87805e1244b0" xlink:to="loc_car_InternationalCapitalLeasesMember_2cd635e1-7a69-47cc-93b7-4b506a0a3a5d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_189fb017-e1e8-4289-b5b7-3d70e585534f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d111e42d-fae8-417d-a1fd-0d429a536b07" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_189fb017-e1e8-4289-b5b7-3d70e585534f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_189fb017-e1e8-4289-b5b7-3d70e585534f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_189fb017-e1e8-4289-b5b7-3d70e585534f" xlink:to="loc_us-gaap_RelatedPartyDomain_189fb017-e1e8-4289-b5b7-3d70e585534f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_7aca8c6f-50d6-4e66-a088-ad12aca40c6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_189fb017-e1e8-4289-b5b7-3d70e585534f" xlink:to="loc_us-gaap_RelatedPartyDomain_7aca8c6f-50d6-4e66-a088-ad12aca40c6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_2f656133-0e24-48e5-b5b1-3bbdf8137a84" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_7aca8c6f-50d6-4e66-a088-ad12aca40c6e" xlink:to="loc_srt_AffiliatedEntityMember_2f656133-0e24-48e5-b5b1-3bbdf8137a84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_97e1effa-6fa6-461d-9f1a-69dae9f9b371" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d111e42d-fae8-417d-a1fd-0d429a536b07" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_97e1effa-6fa6-461d-9f1a-69dae9f9b371" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_97e1effa-6fa6-461d-9f1a-69dae9f9b371_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_97e1effa-6fa6-461d-9f1a-69dae9f9b371" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_97e1effa-6fa6-461d-9f1a-69dae9f9b371_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_3f86db0a-7663-4560-a2e3-520819d5d6e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_97e1effa-6fa6-461d-9f1a-69dae9f9b371" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_3f86db0a-7663-4560-a2e3-520819d5d6e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_dd73d81c-89bd-4811-8844-fbe8ebedf95d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_3f86db0a-7663-4560-a2e3-520819d5d6e6" xlink:to="loc_us-gaap_SecuredDebtMember_dd73d81c-89bd-4811-8844-fbe8ebedf95d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4fc97890-b73b-4822-b14f-17a0f26faaf5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f3c5d999-8c01-48a0-97e4-935a6afe2e37" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4fc97890-b73b-4822-b14f-17a0f26faaf5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_939e8994-de81-4910-9ef0-ac7a326d0c02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f3c5d999-8c01-48a0-97e4-935a6afe2e37" xlink:to="loc_us-gaap_LineOfCredit_939e8994-de81-4910-9ef0-ac7a326d0c02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6a4c0b45-05d4-4673-98ac-76a410a5a48a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f3c5d999-8c01-48a0-97e4-935a6afe2e37" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6a4c0b45-05d4-4673-98ac-76a410a5a48a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="car-20250930.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/CommitmentsandContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_89ae8632-a87e-4724-bfc3-50ab3eeb499d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_20236290-3b27-43d9-9758-0175dcef52b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_89ae8632-a87e-4724-bfc3-50ab3eeb499d" xlink:to="loc_us-gaap_LossContingenciesTable_20236290-3b27-43d9-9758-0175dcef52b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_46c7fb7a-a6c6-4ce4-a760-5dfbaf040ad3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_20236290-3b27-43d9-9758-0175dcef52b4" xlink:to="loc_srt_LitigationCaseAxis_46c7fb7a-a6c6-4ce4-a760-5dfbaf040ad3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_46c7fb7a-a6c6-4ce4-a760-5dfbaf040ad3_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_46c7fb7a-a6c6-4ce4-a760-5dfbaf040ad3" xlink:to="loc_srt_LitigationCaseTypeDomain_46c7fb7a-a6c6-4ce4-a760-5dfbaf040ad3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_2eb52b9a-aba6-4e2b-b21e-8dc249f718cf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_46c7fb7a-a6c6-4ce4-a760-5dfbaf040ad3" xlink:to="loc_srt_LitigationCaseTypeDomain_2eb52b9a-aba6-4e2b-b21e-8dc249f718cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AntitrustLitigationNo.212Md02311Member_1dd1e8ad-afba-4350-b388-e56297ee02a7" xlink:href="car-20250930.xsd#car_AntitrustLitigationNo.212Md02311Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_2eb52b9a-aba6-4e2b-b21e-8dc249f718cf" xlink:to="loc_car_AntitrustLitigationNo.212Md02311Member_1dd1e8ad-afba-4350-b388-e56297ee02a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossRelatedToLitigationSettlement_b381d100-aebd-478b-94d7-a4b2cd787502" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossRelatedToLitigationSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_89ae8632-a87e-4724-bfc3-50ab3eeb499d" xlink:to="loc_us-gaap_GainLossRelatedToLitigationSettlement_b381d100-aebd-478b-94d7-a4b2cd787502" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued_14c9432e-1bb6-4c45-9f5e-9175fdb139e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_89ae8632-a87e-4724-bfc3-50ab3eeb499d" xlink:to="loc_us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued_14c9432e-1bb6-4c45-9f5e-9175fdb139e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_c5f3cbc8-2150-4476-98c0-4f7e1d4b906a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_89ae8632-a87e-4724-bfc3-50ab3eeb499d" xlink:to="loc_us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_c5f3cbc8-2150-4476-98c0-4f7e1d4b906a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermPurchaseCommitmentPeriod_8ca16323-0708-41cc-a0b3-e82a93e8c286" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermPurchaseCommitmentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_89ae8632-a87e-4724-bfc3-50ab3eeb499d" xlink:to="loc_us-gaap_LongtermPurchaseCommitmentPeriod_8ca16323-0708-41cc-a0b3-e82a93e8c286" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_LongTermPurchaseCommitmentPeriodIncreaseDecrease_b72ecdd3-1545-4b3a-b8a9-bd00f93400ab" xlink:href="car-20250930.xsd#car_LongTermPurchaseCommitmentPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_89ae8632-a87e-4724-bfc3-50ab3eeb499d" xlink:to="loc_car_LongTermPurchaseCommitmentPeriodIncreaseDecrease_b72ecdd3-1545-4b3a-b8a9-bd00f93400ab" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/StockholdersEquityScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="car-20250930.xsd#StockholdersEquityScheduleofAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/StockholdersEquityScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_7075398a-3d00-48d8-81f2-e3e2f27c3a63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_c7f5f3a5-e638-495b-b53f-e004ff3fe471" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_7075398a-3d00-48d8-81f2-e3e2f27c3a63" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_c7f5f3a5-e638-495b-b53f-e004ff3fe471" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_ec3dc90d-7b00-4844-8522-16b249b704bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_c7f5f3a5-e638-495b-b53f-e004ff3fe471" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_ec3dc90d-7b00-4844-8522-16b249b704bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ec3dc90d-7b00-4844-8522-16b249b704bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ec3dc90d-7b00-4844-8522-16b249b704bc" xlink:to="loc_us-gaap_EquityComponentDomain_ec3dc90d-7b00-4844-8522-16b249b704bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_943d1171-b7c7-4cb5-b005-bee0adb85171" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ec3dc90d-7b00-4844-8522-16b249b704bc" xlink:to="loc_us-gaap_EquityComponentDomain_943d1171-b7c7-4cb5-b005-bee0adb85171" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_137f0ecd-8fbc-4c26-98da-f177fc121cf3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_943d1171-b7c7-4cb5-b005-bee0adb85171" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_137f0ecd-8fbc-4c26-98da-f177fc121cf3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_66aa7cc4-e84e-4b60-a374-0f7a9e1b8988" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_137f0ecd-8fbc-4c26-98da-f177fc121cf3" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_66aa7cc4-e84e-4b60-a374-0f7a9e1b8988" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_845d9cc8-c586-47a4-af1a-7a09fe651e55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_137f0ecd-8fbc-4c26-98da-f177fc121cf3" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_845d9cc8-c586-47a4-af1a-7a09fe651e55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_2bb234e9-2eac-4e7e-b11d-ea75e9b00857" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_137f0ecd-8fbc-4c26-98da-f177fc121cf3" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_2bb234e9-2eac-4e7e-b11d-ea75e9b00857" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_86cc10aa-79b1-4e9b-95bf-f9073dae0248" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_c7f5f3a5-e638-495b-b53f-e004ff3fe471" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_86cc10aa-79b1-4e9b-95bf-f9073dae0248" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_86cc10aa-79b1-4e9b-95bf-f9073dae0248_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_86cc10aa-79b1-4e9b-95bf-f9073dae0248" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_86cc10aa-79b1-4e9b-95bf-f9073dae0248_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_7ea23d8f-1fb9-4afe-94c9-235dbdf5bfd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_86cc10aa-79b1-4e9b-95bf-f9073dae0248" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_7ea23d8f-1fb9-4afe-94c9-235dbdf5bfd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_2c79169a-1a07-42f4-8b28-caf3a1b79a6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_7ea23d8f-1fb9-4afe-94c9-235dbdf5bfd4" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_2c79169a-1a07-42f4-8b28-caf3a1b79a6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_17571b9d-e194-46d0-9ecf-85f8d144f52e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_c7f5f3a5-e638-495b-b53f-e004ff3fe471" xlink:to="loc_us-gaap_HedgingDesignationAxis_17571b9d-e194-46d0-9ecf-85f8d144f52e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_17571b9d-e194-46d0-9ecf-85f8d144f52e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_17571b9d-e194-46d0-9ecf-85f8d144f52e" xlink:to="loc_us-gaap_HedgingDesignationDomain_17571b9d-e194-46d0-9ecf-85f8d144f52e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_97ede5dd-d656-47dc-845d-151c8a2256a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_17571b9d-e194-46d0-9ecf-85f8d144f52e" xlink:to="loc_us-gaap_HedgingDesignationDomain_97ede5dd-d656-47dc-845d-151c8a2256a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_a3e24b33-3393-417f-89bc-b04827b63e69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_97ede5dd-d656-47dc-845d-151c8a2256a1" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_a3e24b33-3393-417f-89bc-b04827b63e69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_5a581cc6-f93b-47dc-8e31-29c899fd19f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_7075398a-3d00-48d8-81f2-e3e2f27c3a63" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_5a581cc6-f93b-47dc-8e31-29c899fd19f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_a2ef2d18-ee77-43cf-b9ac-d0f3980b0bb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_5a581cc6-f93b-47dc-8e31-29c899fd19f9" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_a2ef2d18-ee77-43cf-b9ac-d0f3980b0bb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_b9add87d-a231-424f-89cc-60ae272deff6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_5a581cc6-f93b-47dc-8e31-29c899fd19f9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_b9add87d-a231-424f-89cc-60ae272deff6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_0191a790-f426-4520-909d-e56c4560d9e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_5a581cc6-f93b-47dc-8e31-29c899fd19f9" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_0191a790-f426-4520-909d-e56c4560d9e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_7d46151f-04ac-4553-82da-1ad1626c5473" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_5a581cc6-f93b-47dc-8e31-29c899fd19f9" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_7d46151f-04ac-4553-82da-1ad1626c5473" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_8b3d382d-ff48-4597-a901-9492c0af9cf1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_5a581cc6-f93b-47dc-8e31-29c899fd19f9" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_8b3d382d-ff48-4597-a901-9492c0af9cf1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_a39a2765-1b31-46a2-87e4-6de4df4476ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_5a581cc6-f93b-47dc-8e31-29c899fd19f9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_a39a2765-1b31-46a2-87e4-6de4df4476ec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_fd82bcd3-0b9f-4b72-83be-385dd1c9aeba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax_c5060a0a-8176-42ba-b249-c2b73a9af915" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_7075398a-3d00-48d8-81f2-e3e2f27c3a63" xlink:to="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax_c5060a0a-8176-42ba-b249-c2b73a9af915" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/RelatedPartyTransactionsNarrativeDetails" xlink:type="simple" xlink:href="car-20250930.xsd#RelatedPartyTransactionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/RelatedPartyTransactionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_2c2c12f5-a084-428d-ae3c-2f4b014afe45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_eb605c04-c6af-4752-9506-e626ac46c981" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2c2c12f5-a084-428d-ae3c-2f4b014afe45" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_eb605c04-c6af-4752-9506-e626ac46c981" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_068fb2e5-7e71-446c-a145-6d3b62bfd2bf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_eb605c04-c6af-4752-9506-e626ac46c981" xlink:to="loc_srt_OwnershipAxis_068fb2e5-7e71-446c-a145-6d3b62bfd2bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_068fb2e5-7e71-446c-a145-6d3b62bfd2bf_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_068fb2e5-7e71-446c-a145-6d3b62bfd2bf" xlink:to="loc_srt_OwnershipDomain_068fb2e5-7e71-446c-a145-6d3b62bfd2bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_48b304e1-82dc-43a5-a0c3-71b631f322c2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_068fb2e5-7e71-446c-a145-6d3b62bfd2bf" xlink:to="loc_srt_OwnershipDomain_48b304e1-82dc-43a5-a0c3-71b631f322c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SubsidiaryEquityMember_5c73b815-df2b-43d4-ab49-5c2ee06bead9" xlink:href="car-20250930.xsd#car_SubsidiaryEquityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_48b304e1-82dc-43a5-a0c3-71b631f322c2" xlink:to="loc_car_SubsidiaryEquityMember_5c73b815-df2b-43d4-ab49-5c2ee06bead9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_d4cf1ad2-d331-4bde-8655-bd5a2f247394" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_eb605c04-c6af-4752-9506-e626ac46c981" xlink:to="loc_dei_LegalEntityAxis_d4cf1ad2-d331-4bde-8655-bd5a2f247394" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d4cf1ad2-d331-4bde-8655-bd5a2f247394_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_d4cf1ad2-d331-4bde-8655-bd5a2f247394" xlink:to="loc_dei_EntityDomain_d4cf1ad2-d331-4bde-8655-bd5a2f247394_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_7d281099-5255-4434-a6fe-22058f7f1ad9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_d4cf1ad2-d331-4bde-8655-bd5a2f247394" xlink:to="loc_dei_EntityDomain_7d281099-5255-4434-a6fe-22058f7f1ad9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SRSMobilityVenturesLLCMember_8f1c1410-0853-42e3-8b78-6158262e15c6" xlink:href="car-20250930.xsd#car_SRSMobilityVenturesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_7d281099-5255-4434-a6fe-22058f7f1ad9" xlink:to="loc_car_SRSMobilityVenturesLLCMember_8f1c1410-0853-42e3-8b78-6158262e15c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_aeb152c8-77e8-475e-837e-e74f41f42c0b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_eb605c04-c6af-4752-9506-e626ac46c981" xlink:to="loc_srt_RangeAxis_aeb152c8-77e8-475e-837e-e74f41f42c0b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_aeb152c8-77e8-475e-837e-e74f41f42c0b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_aeb152c8-77e8-475e-837e-e74f41f42c0b" xlink:to="loc_srt_RangeMember_aeb152c8-77e8-475e-837e-e74f41f42c0b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_be1aa2a0-b3e9-42b1-be77-f9d20b81da99" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_aeb152c8-77e8-475e-837e-e74f41f42c0b" xlink:to="loc_srt_RangeMember_be1aa2a0-b3e9-42b1-be77-f9d20b81da99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_c2cd329d-2f60-4d5c-bf5c-05280ab6d12f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_be1aa2a0-b3e9-42b1-be77-f9d20b81da99" xlink:to="loc_srt_MaximumMember_c2cd329d-2f60-4d5c-bf5c-05280ab6d12f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_4fbd5e90-9e9e-4584-bf76-9a7bab24371d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_eb605c04-c6af-4752-9506-e626ac46c981" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_4fbd5e90-9e9e-4584-bf76-9a7bab24371d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_4fbd5e90-9e9e-4584-bf76-9a7bab24371d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_4fbd5e90-9e9e-4584-bf76-9a7bab24371d" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_4fbd5e90-9e9e-4584-bf76-9a7bab24371d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_3f7b8260-a04e-46c8-9f3f-5e3b9b7a9520" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_4fbd5e90-9e9e-4584-bf76-9a7bab24371d" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_3f7b8260-a04e-46c8-9f3f-5e3b9b7a9520" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_CompanySubsidiaryMember_7ed1b1d0-5ff3-49eb-80cf-dd7e984382f1" xlink:href="car-20250930.xsd#car_CompanySubsidiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_3f7b8260-a04e-46c8-9f3f-5e3b9b7a9520" xlink:to="loc_car_CompanySubsidiaryMember_7ed1b1d0-5ff3-49eb-80cf-dd7e984382f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_2c486069-55bf-44d6-8c16-e3c405481713" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2c2c12f5-a084-428d-ae3c-2f4b014afe45" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_2c486069-55bf-44d6-8c16-e3c405481713" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_de4eed7d-ce3b-4691-8bf6-e388c1965424" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_2c2c12f5-a084-428d-ae3c-2f4b014afe45" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_de4eed7d-ce3b-4691-8bf6-e388c1965424" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/RelatedPartyTransactionsScheduleofEquityMethodInvestmentinBalanceSheetandStatementsofComprehensiveIncomeExpenseDetails" xlink:type="simple" xlink:href="car-20250930.xsd#RelatedPartyTransactionsScheduleofEquityMethodInvestmentinBalanceSheetandStatementsofComprehensiveIncomeExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/RelatedPartyTransactionsScheduleofEquityMethodInvestmentinBalanceSheetandStatementsofComprehensiveIncomeExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_dc9c2aa3-0508-4968-ada3-d5e87db45069" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_8bb6ee04-0ee0-4382-90ae-6ef2a251d48a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_dc9c2aa3-0508-4968-ada3-d5e87db45069" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_8bb6ee04-0ee0-4382-90ae-6ef2a251d48a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_617c117d-380d-4051-8bdc-d89523de845b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_8bb6ee04-0ee0-4382-90ae-6ef2a251d48a" xlink:to="loc_srt_CounterpartyNameAxis_617c117d-380d-4051-8bdc-d89523de845b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_617c117d-380d-4051-8bdc-d89523de845b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_617c117d-380d-4051-8bdc-d89523de845b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_617c117d-380d-4051-8bdc-d89523de845b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_1629734a-cdd0-4bba-b968-ed7652d68adc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_617c117d-380d-4051-8bdc-d89523de845b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_1629734a-cdd0-4bba-b968-ed7652d68adc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisMobilityVenturesLLCAMVMember_4e8af508-52a0-4c74-ab72-74868bf9d300" xlink:href="car-20250930.xsd#car_AvisMobilityVenturesLLCAMVMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_1629734a-cdd0-4bba-b968-ed7652d68adc" xlink:to="loc_car_AvisMobilityVenturesLLCAMVMember_4e8af508-52a0-4c74-ab72-74868bf9d300" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_3824b87e-f22e-4386-9233-bbde6667539f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_8bb6ee04-0ee0-4382-90ae-6ef2a251d48a" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_3824b87e-f22e-4386-9233-bbde6667539f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_3824b87e-f22e-4386-9233-bbde6667539f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_3824b87e-f22e-4386-9233-bbde6667539f" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_3824b87e-f22e-4386-9233-bbde6667539f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_57b0ffa4-4592-41d6-9615-7225f8fe4bef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_3824b87e-f22e-4386-9233-bbde6667539f" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_57b0ffa4-4592-41d6-9615-7225f8fe4bef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AdministrativeServicesMember_7d6b73da-0730-4861-a3b5-d4d80de60bf1" xlink:href="car-20250930.xsd#car_AdministrativeServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_57b0ffa4-4592-41d6-9615-7225f8fe4bef" xlink:to="loc_car_AdministrativeServicesMember_7d6b73da-0730-4861-a3b5-d4d80de60bf1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_EquipmentInvestmentMember_eb0b80ab-2482-4be8-a63c-07a95abdd2c5" xlink:href="car-20250930.xsd#car_EquipmentInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_57b0ffa4-4592-41d6-9615-7225f8fe4bef" xlink:to="loc_car_EquipmentInvestmentMember_eb0b80ab-2482-4be8-a63c-07a95abdd2c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_ReceivablesFromRelatedPartyMember_7b3f3312-1ff9-4b37-a87c-806eb4d94abc" xlink:href="car-20250930.xsd#car_ReceivablesFromRelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_57b0ffa4-4592-41d6-9615-7225f8fe4bef" xlink:to="loc_car_ReceivablesFromRelatedPartyMember_7b3f3312-1ff9-4b37-a87c-806eb4d94abc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_4205dedc-b979-4900-ad8c-b9264a1782ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_8bb6ee04-0ee0-4382-90ae-6ef2a251d48a" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_4205dedc-b979-4900-ad8c-b9264a1782ba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_4205dedc-b979-4900-ad8c-b9264a1782ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_4205dedc-b979-4900-ad8c-b9264a1782ba" xlink:to="loc_us-gaap_RelatedPartyDomain_4205dedc-b979-4900-ad8c-b9264a1782ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_555a3771-183d-47bf-a404-3ae54ff6c3e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_4205dedc-b979-4900-ad8c-b9264a1782ba" xlink:to="loc_us-gaap_RelatedPartyDomain_555a3771-183d-47bf-a404-3ae54ff6c3e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_1f72d529-9dad-4bcf-9e7e-7a401cef86cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_555a3771-183d-47bf-a404-3ae54ff6c3e9" xlink:to="loc_us-gaap_RelatedPartyMember_1f72d529-9dad-4bcf-9e7e-7a401cef86cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eb74326a-ce47-40c5-82b5-c2b877bcf8b2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_8bb6ee04-0ee0-4382-90ae-6ef2a251d48a" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eb74326a-ce47-40c5-82b5-c2b877bcf8b2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_eb74326a-ce47-40c5-82b5-c2b877bcf8b2_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eb74326a-ce47-40c5-82b5-c2b877bcf8b2" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_eb74326a-ce47-40c5-82b5-c2b877bcf8b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_48677a58-a031-4441-9ac5-b2586575c802" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eb74326a-ce47-40c5-82b5-c2b877bcf8b2" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_48677a58-a031-4441-9ac5-b2586575c802" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisMobilityVenturesLLCAMVMember_83a184ad-a8be-4e56-b75f-3198ced2c237" xlink:href="car-20250930.xsd#car_AvisMobilityVenturesLLCAMVMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_48677a58-a031-4441-9ac5-b2586575c802" xlink:to="loc_car_AvisMobilityVenturesLLCAMVMember_83a184ad-a8be-4e56-b75f-3198ced2c237" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_5951b379-a258-4b3d-bd14-93cacc7594a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_dc9c2aa3-0508-4968-ada3-d5e87db45069" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_5951b379-a258-4b3d-bd14-93cacc7594a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_VehiclesNet_602f4414-da0a-4234-9900-db9cc7aa0559" xlink:href="car-20250930.xsd#car_VehiclesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_dc9c2aa3-0508-4968-ada3-d5e87db45069" xlink:to="loc_car_VehiclesNet_602f4414-da0a-4234-9900-db9cc7aa0559" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_34f0236d-9791-4efd-93fd-e44e0fdd4223" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_dc9c2aa3-0508-4968-ada3-d5e87db45069" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_34f0236d-9791-4efd-93fd-e44e0fdd4223" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_VehicleNetInvestmentInLeaseReceivables_49aecbdf-87a6-48da-bb99-31dfe071ec72" xlink:href="car-20250930.xsd#car_VehicleNetInvestmentInLeaseReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_dc9c2aa3-0508-4968-ada3-d5e87db45069" xlink:to="loc_car_VehicleNetInvestmentInLeaseReceivables_49aecbdf-87a6-48da-bb99-31dfe071ec72" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/StockBasedCompensationScheduleofStockBasedCompensationActivityDetails" xlink:type="simple" xlink:href="car-20250930.xsd#StockBasedCompensationScheduleofStockBasedCompensationActivityDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/StockBasedCompensationScheduleofStockBasedCompensationActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e89ff5fd-da9a-45e2-b8c1-c01930a4c22b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e89ff5fd-da9a-45e2-b8c1-c01930a4c22b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b8b84709-3a71-456c-b281-c2f25e6efe01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e89ff5fd-da9a-45e2-b8c1-c01930a4c22b" xlink:to="loc_us-gaap_AwardTypeAxis_b8b84709-3a71-456c-b281-c2f25e6efe01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b8b84709-3a71-456c-b281-c2f25e6efe01_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b8b84709-3a71-456c-b281-c2f25e6efe01" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b8b84709-3a71-456c-b281-c2f25e6efe01_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_360eee9a-6671-413e-ae6c-62755f6f0097" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b8b84709-3a71-456c-b281-c2f25e6efe01" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_360eee9a-6671-413e-ae6c-62755f6f0097" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_f058e325-4db6-46a0-b8cb-6f85c9ab8064" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_360eee9a-6671-413e-ae6c-62755f6f0097" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_f058e325-4db6-46a0-b8cb-6f85c9ab8064" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_be1c16ca-99e3-4b40-ae42-8640cb55da7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_360eee9a-6671-413e-ae6c-62755f6f0097" xlink:to="loc_us-gaap_PerformanceSharesMember_be1c16ca-99e3-4b40-ae42-8640cb55da7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_RestrictedStockUnitsTimeBasedMember_32ddd276-71d3-4cb5-b0c7-48cf28be7d13" xlink:href="car-20250930.xsd#car_RestrictedStockUnitsTimeBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PerformanceSharesMember_be1c16ca-99e3-4b40-ae42-8640cb55da7f" xlink:to="loc_car_RestrictedStockUnitsTimeBasedMember_32ddd276-71d3-4cb5-b0c7-48cf28be7d13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_RestrictedStockUnitsPerformanceBasedMember_27674ba6-add2-47a9-8d2f-cec0094c1e21" xlink:href="car-20250930.xsd#car_RestrictedStockUnitsPerformanceBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PerformanceSharesMember_be1c16ca-99e3-4b40-ae42-8640cb55da7f" xlink:to="loc_car_RestrictedStockUnitsPerformanceBasedMember_27674ba6-add2-47a9-8d2f-cec0094c1e21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_056267e8-d156-4f77-8f82-e0e851fac1b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_056267e8-d156-4f77-8f82-e0e851fac1b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_51e2529a-e4ea-446f-aa64-fe3a436ee01d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_056267e8-d156-4f77-8f82-e0e851fac1b3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_51e2529a-e4ea-446f-aa64-fe3a436ee01d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_32d5fee9-f734-4f4a-ab2c-7fd51e885828" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_056267e8-d156-4f77-8f82-e0e851fac1b3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_32d5fee9-f734-4f4a-ab2c-7fd51e885828" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6f1b328f-ea0d-4241-b7b8-d37c7ab480a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_056267e8-d156-4f77-8f82-e0e851fac1b3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6f1b328f-ea0d-4241-b7b8-d37c7ab480a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_dae94215-4cb0-4031-aa8a-2cc18ac4c040" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_056267e8-d156-4f77-8f82-e0e851fac1b3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_dae94215-4cb0-4031-aa8a-2cc18ac4c040" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_42fa3408-c22b-4c04-b89b-59f8be4b4b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestNumberofSharesOutstanding_c6a4632f-960e-4554-b2b1-53f1ce38d4d8" xlink:href="car-20250930.xsd#car_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestNumberofSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_car_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestNumberofSharesOutstanding_c6a4632f-960e-4554-b2b1-53f1ce38d4d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_493e2316-fbd8-4fd9-88d2-05f33bce90d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_493e2316-fbd8-4fd9-88d2-05f33bce90d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1141c163-77c6-4cff-825b-a24b146e1083" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_493e2316-fbd8-4fd9-88d2-05f33bce90d5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1141c163-77c6-4cff-825b-a24b146e1083" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_07666de8-1ca1-40b6-9f34-a9de3e5ce436" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_493e2316-fbd8-4fd9-88d2-05f33bce90d5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_07666de8-1ca1-40b6-9f34-a9de3e5ce436" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_81341c2e-7d35-4240-8bc7-fd2b0cd3693b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_493e2316-fbd8-4fd9-88d2-05f33bce90d5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_81341c2e-7d35-4240-8bc7-fd2b0cd3693b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_932686b6-19d8-4ff3-8c99-82f04e01b499" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_493e2316-fbd8-4fd9-88d2-05f33bce90d5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_932686b6-19d8-4ff3-8c99-82f04e01b499" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9aeb788d-3a7f-421f-bd5f-81997b9f0813" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestWeightedAverageGrantDateFairValue_a7c497d8-f6c9-4381-ab72-7d35772e2a01" xlink:href="car-20250930.xsd#car_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_car_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestWeightedAverageGrantDateFairValue_a7c497d8-f6c9-4381-ab72-7d35772e2a01" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageRemainingContractualTerm_9cac8c83-6448-4bec-bda0-dc8b141ab663" xlink:href="car-20250930.xsd#car_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageRemainingContractualTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_car_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageRemainingContractualTerm_9cac8c83-6448-4bec-bda0-dc8b141ab663" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_66ceba0b-73e7-4b38-8c4c-ceb2dc8da716" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_66ceba0b-73e7-4b38-8c4c-ceb2dc8da716" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExpectedToVest_541cff15-651e-43de-b0d8-cf4eabdc1468" xlink:href="car-20250930.xsd#car_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExpectedToVest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_car_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExpectedToVest_541cff15-651e-43de-b0d8-cf4eabdc1468" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_debdd33b-0e5d-4eae-a89c-f06290eac56d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_debdd33b-0e5d-4eae-a89c-f06290eac56d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_6c7c4ab1-3524-450d-891a-498096c082de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_6c7c4ab1-3524-450d-891a-498096c082de" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_d01e3d33-5b3c-41af-9b58-fd9565752908" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_d01e3d33-5b3c-41af-9b58-fd9565752908" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_1ac2f6d3-ddf9-4bf5-910d-30a6ec8a07dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a7305ade-09df-4404-80d1-bf4b33f50de5" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_1ac2f6d3-ddf9-4bf5-910d-30a6ec8a07dc" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/FinancialInstrumentsScheduleofNotationalAmountsofDerivativesHeldDetails" xlink:type="simple" xlink:href="car-20250930.xsd#FinancialInstrumentsScheduleofNotationalAmountsofDerivativesHeldDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/FinancialInstrumentsScheduleofNotationalAmountsofDerivativesHeldDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_5779a544-fc0c-4ca3-aa1e-6c578dab6f64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_5ee0677a-028f-4cb3-9c98-9f6462709533" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_5779a544-fc0c-4ca3-aa1e-6c578dab6f64" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_5ee0677a-028f-4cb3-9c98-9f6462709533" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_e981f8eb-8555-46a1-9e94-78f40a8d8bfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_5ee0677a-028f-4cb3-9c98-9f6462709533" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_e981f8eb-8555-46a1-9e94-78f40a8d8bfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_e981f8eb-8555-46a1-9e94-78f40a8d8bfe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_e981f8eb-8555-46a1-9e94-78f40a8d8bfe" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_e981f8eb-8555-46a1-9e94-78f40a8d8bfe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_41071d4e-7f82-4008-9ec1-a4fa609fc07e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_e981f8eb-8555-46a1-9e94-78f40a8d8bfe" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_41071d4e-7f82-4008-9ec1-a4fa609fc07e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_b0a9a33d-53ee-4b9a-b9ad-54958ce5f352" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_41071d4e-7f82-4008-9ec1-a4fa609fc07e" xlink:to="loc_us-gaap_CurrencySwapMember_b0a9a33d-53ee-4b9a-b9ad-54958ce5f352" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_InterestRateCapsMember_9496a9b4-b87d-4106-9c7b-1cca349225c0" xlink:href="car-20250930.xsd#car_InterestRateCapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_41071d4e-7f82-4008-9ec1-a4fa609fc07e" xlink:to="loc_car_InterestRateCapsMember_9496a9b4-b87d-4106-9c7b-1cca349225c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_ccffb05f-ab47-489c-8d10-bd1610eaca2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_41071d4e-7f82-4008-9ec1-a4fa609fc07e" xlink:to="loc_us-gaap_InterestRateSwapMember_ccffb05f-ab47-489c-8d10-bd1610eaca2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SoldMember_282e8c64-0421-4a8c-a1e5-b7c95c4fe67d" xlink:href="car-20250930.xsd#car_SoldMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_41071d4e-7f82-4008-9ec1-a4fa609fc07e" xlink:to="loc_car_SoldMember_282e8c64-0421-4a8c-a1e5-b7c95c4fe67d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_PurchaseMember_7102e951-0b3a-46d0-976c-5b527e4dad3d" xlink:href="car-20250930.xsd#car_PurchaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_41071d4e-7f82-4008-9ec1-a4fa609fc07e" xlink:to="loc_car_PurchaseMember_7102e951-0b3a-46d0-976c-5b527e4dad3d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_c4324364-4088-4b54-9e2c-f96649d9b37f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_5ee0677a-028f-4cb3-9c98-9f6462709533" xlink:to="loc_srt_ConsolidatedEntitiesAxis_c4324364-4088-4b54-9e2c-f96649d9b37f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_c4324364-4088-4b54-9e2c-f96649d9b37f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_c4324364-4088-4b54-9e2c-f96649d9b37f" xlink:to="loc_srt_ConsolidatedEntitiesDomain_c4324364-4088-4b54-9e2c-f96649d9b37f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_cac36578-490e-4fdd-a273-403f7a379e82" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_c4324364-4088-4b54-9e2c-f96649d9b37f" xlink:to="loc_srt_ConsolidatedEntitiesDomain_cac36578-490e-4fdd-a273-403f7a379e82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SubsidiariesMember_da47e881-d8bd-492a-9049-0982233e2a1b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_cac36578-490e-4fdd-a273-403f7a379e82" xlink:to="loc_srt_SubsidiariesMember_da47e881-d8bd-492a-9049-0982233e2a1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_b7cb9351-0bb0-43ba-9eca-984a16405be4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_5779a544-fc0c-4ca3-aa1e-6c578dab6f64" xlink:to="loc_us-gaap_DerivativeNotionalAmount_b7cb9351-0bb0-43ba-9eca-984a16405be4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/FinancialInstrumentsScheduleofFairValuesofDerivativesInstrumentsDetails" xlink:type="simple" xlink:href="car-20250930.xsd#FinancialInstrumentsScheduleofFairValuesofDerivativesInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/FinancialInstrumentsScheduleofFairValuesofDerivativesInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_ce404e6c-75c0-48b3-8105-f479f8291d64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_e92df942-1462-411c-b594-99ceb10a979c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_ce404e6c-75c0-48b3-8105-f479f8291d64" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_e92df942-1462-411c-b594-99ceb10a979c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_fbf8d5c0-a466-46d7-924a-ad23341c1356" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_e92df942-1462-411c-b594-99ceb10a979c" xlink:to="loc_us-gaap_HedgingDesignationAxis_fbf8d5c0-a466-46d7-924a-ad23341c1356" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_fbf8d5c0-a466-46d7-924a-ad23341c1356_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_fbf8d5c0-a466-46d7-924a-ad23341c1356" xlink:to="loc_us-gaap_HedgingDesignationDomain_fbf8d5c0-a466-46d7-924a-ad23341c1356_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_1295282b-9aeb-4fec-94f0-781917359e44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_fbf8d5c0-a466-46d7-924a-ad23341c1356" xlink:to="loc_us-gaap_HedgingDesignationDomain_1295282b-9aeb-4fec-94f0-781917359e44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_2e56f2b8-19c3-4ae3-a147-2bc342c3dc88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_1295282b-9aeb-4fec-94f0-781917359e44" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_2e56f2b8-19c3-4ae3-a147-2bc342c3dc88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_d0ab18d5-7b15-43a9-a429-d9a13ec2a759" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_1295282b-9aeb-4fec-94f0-781917359e44" xlink:to="loc_us-gaap_NondesignatedMember_d0ab18d5-7b15-43a9-a429-d9a13ec2a759" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_29272408-6e7d-4596-985b-57fd972b496d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_e92df942-1462-411c-b594-99ceb10a979c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_29272408-6e7d-4596-985b-57fd972b496d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_29272408-6e7d-4596-985b-57fd972b496d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_29272408-6e7d-4596-985b-57fd972b496d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_29272408-6e7d-4596-985b-57fd972b496d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_7c6dd2d0-bbcf-4b12-9273-9097b99dcc81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_29272408-6e7d-4596-985b-57fd972b496d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_7c6dd2d0-bbcf-4b12-9273-9097b99dcc81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_34d3633d-5aa3-4a15-9da0-fbe409ef2dee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_7c6dd2d0-bbcf-4b12-9273-9097b99dcc81" xlink:to="loc_us-gaap_InterestRateSwapMember_34d3633d-5aa3-4a15-9da0-fbe409ef2dee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_3122afc2-7167-431d-9c8b-0704518adfe7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_7c6dd2d0-bbcf-4b12-9273-9097b99dcc81" xlink:to="loc_us-gaap_ForeignExchangeContractMember_3122afc2-7167-431d-9c8b-0704518adfe7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_e7a5d1f5-9a16-4846-bd40-0427438b3560" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_7c6dd2d0-bbcf-4b12-9273-9097b99dcc81" xlink:to="loc_us-gaap_InterestRateContractMember_e7a5d1f5-9a16-4846-bd40-0427438b3560" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_d09d40bc-0e1e-4b0a-a275-67a4412c14ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_ce404e6c-75c0-48b3-8105-f479f8291d64" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_d09d40bc-0e1e-4b0a-a275-67a4412c14ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_315ab2a8-554f-4adc-aeba-01bef41ea9b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_ce404e6c-75c0-48b3-8105-f479f8291d64" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_315ab2a8-554f-4adc-aeba-01bef41ea9b0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/FinancialInstrumentsScheduleofEffectsofDerivativesRecognizedDetails" xlink:type="simple" xlink:href="car-20250930.xsd#FinancialInstrumentsScheduleofEffectsofDerivativesRecognizedDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/FinancialInstrumentsScheduleofEffectsofDerivativesRecognizedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_5f030ec3-c41d-457f-bda6-42237ab7483f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_295fa319-6005-474f-b752-bbe619e98992" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_5f030ec3-c41d-457f-bda6-42237ab7483f" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_295fa319-6005-474f-b752-bbe619e98992" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_f7ff29b3-40d9-4caa-b27d-1f840322c710" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_295fa319-6005-474f-b752-bbe619e98992" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_f7ff29b3-40d9-4caa-b27d-1f840322c710" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_f7ff29b3-40d9-4caa-b27d-1f840322c710_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_f7ff29b3-40d9-4caa-b27d-1f840322c710" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_f7ff29b3-40d9-4caa-b27d-1f840322c710_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_f1cdd919-c152-4fbd-881f-50a970f3087c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_f7ff29b3-40d9-4caa-b27d-1f840322c710" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_f1cdd919-c152-4fbd-881f-50a970f3087c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_92728a62-5ab5-4c5f-87a0-e09d840f9b87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f1cdd919-c152-4fbd-881f-50a970f3087c" xlink:to="loc_us-gaap_InterestRateSwapMember_92728a62-5ab5-4c5f-87a0-e09d840f9b87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_EuroDenominatedNotesMember_8b6e6358-eebf-435c-99dd-0e2bc81a65b3" xlink:href="car-20250930.xsd#car_EuroDenominatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f1cdd919-c152-4fbd-881f-50a970f3087c" xlink:to="loc_car_EuroDenominatedNotesMember_8b6e6358-eebf-435c-99dd-0e2bc81a65b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_2db8b30d-dada-458d-aae4-6cfd18dab7af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f1cdd919-c152-4fbd-881f-50a970f3087c" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_2db8b30d-dada-458d-aae4-6cfd18dab7af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_fd1723e2-059a-44e0-b137-19220dfdb2cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_295fa319-6005-474f-b752-bbe619e98992" xlink:to="loc_us-gaap_HedgingDesignationAxis_fd1723e2-059a-44e0-b137-19220dfdb2cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_fd1723e2-059a-44e0-b137-19220dfdb2cf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_fd1723e2-059a-44e0-b137-19220dfdb2cf" xlink:to="loc_us-gaap_HedgingDesignationDomain_fd1723e2-059a-44e0-b137-19220dfdb2cf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_b2e8dafe-4d1c-420d-852c-4a6551f0d6f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_fd1723e2-059a-44e0-b137-19220dfdb2cf" xlink:to="loc_us-gaap_HedgingDesignationDomain_b2e8dafe-4d1c-420d-852c-4a6551f0d6f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_769b5473-f37c-4573-8d18-70dece810e59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_b2e8dafe-4d1c-420d-852c-4a6551f0d6f6" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_769b5473-f37c-4573-8d18-70dece810e59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_0ae7307d-39d4-454c-a370-dc74437f3f7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_b2e8dafe-4d1c-420d-852c-4a6551f0d6f6" xlink:to="loc_us-gaap_NondesignatedMember_0ae7307d-39d4-454c-a370-dc74437f3f7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_4a625afe-c1fd-4f64-8f70-1f92b0ceab2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_5f030ec3-c41d-457f-bda6-42237ab7483f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_4a625afe-c1fd-4f64-8f70-1f92b0ceab2f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/FinancialInstrumentsScheduleofCarryingAmountsandEstimatedFairValuesDetails" xlink:type="simple" xlink:href="car-20250930.xsd#FinancialInstrumentsScheduleofCarryingAmountsandEstimatedFairValuesDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/FinancialInstrumentsScheduleofCarryingAmountsandEstimatedFairValuesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_3f38efbf-2ef5-465a-a4fe-04d7ec4ead94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4edcd799-c420-44e1-9ca3-0776694f30a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_3f38efbf-2ef5-465a-a4fe-04d7ec4ead94" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4edcd799-c420-44e1-9ca3-0776694f30a6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_0c26beb8-84c3-45f4-a3d3-504921f30bcc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4edcd799-c420-44e1-9ca3-0776694f30a6" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_0c26beb8-84c3-45f4-a3d3-504921f30bcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_0c26beb8-84c3-45f4-a3d3-504921f30bcc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_0c26beb8-84c3-45f4-a3d3-504921f30bcc" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_0c26beb8-84c3-45f4-a3d3-504921f30bcc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_4cbfee5f-796d-4b72-b3c3-a1894c02b208" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_0c26beb8-84c3-45f4-a3d3-504921f30bcc" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_4cbfee5f-796d-4b72-b3c3-a1894c02b208" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_756d78e0-412c-4631-9c9b-c5d92ddf3ee4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_4cbfee5f-796d-4b72-b3c3-a1894c02b208" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_756d78e0-412c-4631-9c9b-c5d92ddf3ee4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_1d0b296d-1ff9-472b-a369-6f96c162d9a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_756d78e0-412c-4631-9c9b-c5d92ddf3ee4" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_1d0b296d-1ff9-472b-a369-6f96c162d9a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_a0c28775-4744-4183-957e-17a32fbb4bb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_756d78e0-412c-4631-9c9b-c5d92ddf3ee4" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_a0c28775-4744-4183-957e-17a32fbb4bb7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_aba1c3a0-7364-4242-8979-a67d835a558c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4edcd799-c420-44e1-9ca3-0776694f30a6" xlink:to="loc_srt_CounterpartyNameAxis_aba1c3a0-7364-4242-8979-a67d835a558c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_aba1c3a0-7364-4242-8979-a67d835a558c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_aba1c3a0-7364-4242-8979-a67d835a558c" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_aba1c3a0-7364-4242-8979-a67d835a558c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0752734c-2a98-41eb-86e8-594e552e1683" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_aba1c3a0-7364-4242-8979-a67d835a558c" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0752734c-2a98-41eb-86e8-594e552e1683" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AvisBudgetRentalCarFundingMember_00171e42-1045-4388-84d9-ff8c89973356" xlink:href="car-20250930.xsd#car_AvisBudgetRentalCarFundingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0752734c-2a98-41eb-86e8-594e552e1683" xlink:to="loc_car_AvisBudgetRentalCarFundingMember_00171e42-1045-4388-84d9-ff8c89973356" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_7b324024-bbd2-42af-ad2b-bb9dd5061e43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4edcd799-c420-44e1-9ca3-0776694f30a6" xlink:to="loc_us-gaap_DebtInstrumentAxis_7b324024-bbd2-42af-ad2b-bb9dd5061e43" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7b324024-bbd2-42af-ad2b-bb9dd5061e43_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_7b324024-bbd2-42af-ad2b-bb9dd5061e43" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7b324024-bbd2-42af-ad2b-bb9dd5061e43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d5f7cc24-76a1-4b2c-ba05-0bc2a13b5696" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_7b324024-bbd2-42af-ad2b-bb9dd5061e43" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d5f7cc24-76a1-4b2c-ba05-0bc2a13b5696" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_VehicleBackedDebtMember_e3100434-fc4e-40e7-ad0c-dc279df510c5" xlink:href="car-20250930.xsd#car_VehicleBackedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d5f7cc24-76a1-4b2c-ba05-0bc2a13b5696" xlink:to="loc_car_VehicleBackedDebtMember_e3100434-fc4e-40e7-ad0c-dc279df510c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_b5299e2e-5f54-4026-a2ab-ec0f70ac6121" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4edcd799-c420-44e1-9ca3-0776694f30a6" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_b5299e2e-5f54-4026-a2ab-ec0f70ac6121" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_b5299e2e-5f54-4026-a2ab-ec0f70ac6121_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_b5299e2e-5f54-4026-a2ab-ec0f70ac6121" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_b5299e2e-5f54-4026-a2ab-ec0f70ac6121_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_906c9b96-d709-42f3-9dd0-40b60e85eb0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_b5299e2e-5f54-4026-a2ab-ec0f70ac6121" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_906c9b96-d709-42f3-9dd0-40b60e85eb0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_31a4bb33-bd1f-4f2c-ab53-5b9fdd097564" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_906c9b96-d709-42f3-9dd0-40b60e85eb0b" xlink:to="loc_us-gaap_InterestRateContractMember_31a4bb33-bd1f-4f2c-ab53-5b9fdd097564" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_a17ab307-0624-4ae3-9cc5-0311e2d2e3ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4edcd799-c420-44e1-9ca3-0776694f30a6" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_a17ab307-0624-4ae3-9cc5-0311e2d2e3ad" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a17ab307-0624-4ae3-9cc5-0311e2d2e3ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_a17ab307-0624-4ae3-9cc5-0311e2d2e3ad" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a17ab307-0624-4ae3-9cc5-0311e2d2e3ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6fbc0fb1-7180-4a7d-bae4-993ee661dbab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_a17ab307-0624-4ae3-9cc5-0311e2d2e3ad" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6fbc0fb1-7180-4a7d-bae4-993ee661dbab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_7d86b174-53a5-4195-a6c5-1383edc00ce8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6fbc0fb1-7180-4a7d-bae4-993ee661dbab" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_7d86b174-53a5-4195-a6c5-1383edc00ce8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_7cb5c707-668c-4c5f-bb5d-238b2b68631e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_3f38efbf-2ef5-465a-a4fe-04d7ec4ead94" xlink:to="loc_us-gaap_LongTermDebtCurrent_7cb5c707-668c-4c5f-bb5d-238b2b68631e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_6b40b872-cbd5-45df-8ffd-4194fdabf90e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_3f38efbf-2ef5-465a-a4fe-04d7ec4ead94" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_6b40b872-cbd5-45df-8ffd-4194fdabf90e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_887e64a9-f577-47c0-be90-72f485d42efa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_3f38efbf-2ef5-465a-a4fe-04d7ec4ead94" xlink:to="loc_us-gaap_DebtInstrumentFairValue_887e64a9-f577-47c0-be90-72f485d42efa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_279b071b-9cd3-45f0-800d-d45c75559121" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_3f38efbf-2ef5-465a-a4fe-04d7ec4ead94" xlink:to="loc_us-gaap_DerivativeLiabilities_279b071b-9cd3-45f0-800d-d45c75559121" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/SegmentInformationScheduleofSegmentsInformationDetails" xlink:type="simple" xlink:href="car-20250930.xsd#SegmentInformationScheduleofSegmentsInformationDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/SegmentInformationScheduleofSegmentsInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_fb1c1015-6a65-4473-ac34-d03761422bdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_c16611c5-6de5-4d3b-a895-49f5160fb88c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_fb1c1015-6a65-4473-ac34-d03761422bdf" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_c16611c5-6de5-4d3b-a895-49f5160fb88c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_8e000e5d-d6f0-4e45-8381-a284c2a2b0b5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_c16611c5-6de5-4d3b-a895-49f5160fb88c" xlink:to="loc_srt_ConsolidationItemsAxis_8e000e5d-d6f0-4e45-8381-a284c2a2b0b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_8e000e5d-d6f0-4e45-8381-a284c2a2b0b5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_8e000e5d-d6f0-4e45-8381-a284c2a2b0b5" xlink:to="loc_srt_ConsolidationItemsDomain_8e000e5d-d6f0-4e45-8381-a284c2a2b0b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_714e8486-dc25-4284-8d18-ead51d9bf3a2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_8e000e5d-d6f0-4e45-8381-a284c2a2b0b5" xlink:to="loc_srt_ConsolidationItemsDomain_714e8486-dc25-4284-8d18-ead51d9bf3a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_8f6889f6-46f6-4a04-937e-412fd3607339" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_714e8486-dc25-4284-8d18-ead51d9bf3a2" xlink:to="loc_us-gaap_OperatingSegmentsMember_8f6889f6-46f6-4a04-937e-412fd3607339" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_6be54ae9-8667-4259-8154-27edf58f11bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_714e8486-dc25-4284-8d18-ead51d9bf3a2" xlink:to="loc_us-gaap_CorporateNonSegmentMember_6be54ae9-8667-4259-8154-27edf58f11bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3138594e-6cea-47a3-8cc8-844610152d63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_c16611c5-6de5-4d3b-a895-49f5160fb88c" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_3138594e-6cea-47a3-8cc8-844610152d63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_3138594e-6cea-47a3-8cc8-844610152d63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3138594e-6cea-47a3-8cc8-844610152d63" xlink:to="loc_us-gaap_SegmentDomain_3138594e-6cea-47a3-8cc8-844610152d63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_79012bc4-be78-45ed-b1d4-258f39efba25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3138594e-6cea-47a3-8cc8-844610152d63" xlink:to="loc_us-gaap_SegmentDomain_79012bc4-be78-45ed-b1d4-258f39efba25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AmericasSegmentMember_14738ec4-0a33-4350-b524-4dcfeddb8ea5" xlink:href="car-20250930.xsd#car_AmericasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_79012bc4-be78-45ed-b1d4-258f39efba25" xlink:to="loc_car_AmericasSegmentMember_14738ec4-0a33-4350-b524-4dcfeddb8ea5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_InternationalMember_6736f27c-3c0f-47e4-a90f-ecc5d4d64e2d" xlink:href="car-20250930.xsd#car_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_79012bc4-be78-45ed-b1d4-258f39efba25" xlink:to="loc_car_InternationalMember_6736f27c-3c0f-47e4-a90f-ecc5d4d64e2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_01909390-7b14-4235-8466-ebd967be6466" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_fb1c1015-6a65-4473-ac34-d03761422bdf" xlink:to="loc_us-gaap_Revenues_01909390-7b14-4235-8466-ebd967be6466" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SegmentExpensesAbstract_3c0e1b2c-cb98-4d65-8af5-c0670fb88991" xlink:href="car-20250930.xsd#car_SegmentExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_fb1c1015-6a65-4473-ac34-d03761422bdf" xlink:to="loc_car_SegmentExpensesAbstract_3c0e1b2c-cb98-4d65-8af5-c0670fb88991" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingCostsAndExpenses_92f696a7-f7cb-402b-9a07-ee18e01a0614" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingCostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_SegmentExpensesAbstract_3c0e1b2c-cb98-4d65-8af5-c0670fb88991" xlink:to="loc_us-gaap_OperatingCostsAndExpenses_92f696a7-f7cb-402b-9a07-ee18e01a0614" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciation_91da6d85-06b5-4edb-b6d9-08921c5ce2a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSoldDepreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_SegmentExpensesAbstract_3c0e1b2c-cb98-4d65-8af5-c0670fb88991" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciation_91da6d85-06b5-4edb-b6d9-08921c5ce2a4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_6382858b-187f-4e00-b062-7a14c871ae7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_SegmentExpensesAbstract_3c0e1b2c-cb98-4d65-8af5-c0670fb88991" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_6382858b-187f-4e00-b062-7a14c871ae7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_VehicleInterestNet_8c8137e6-829e-4397-b597-0edbeecec2e6" xlink:href="car-20250930.xsd#car_VehicleInterestNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_SegmentExpensesAbstract_3c0e1b2c-cb98-4d65-8af5-c0670fb88991" xlink:to="loc_car_VehicleInterestNet_8c8137e6-829e-4397-b597-0edbeecec2e6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization_e43b20ea-581f-4e87-b4e4-8e272b476eed" xlink:href="car-20250930.xsd#car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_SegmentExpensesAbstract_3c0e1b2c-cb98-4d65-8af5-c0670fb88991" xlink:to="loc_car_AdjustedEarningsBeforeIncomeDepreciationAndAmortization_e43b20ea-581f-4e87-b4e4-8e272b476eed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:href="car-20250930.xsd#car_AdjustmentsToEBITDAAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_fb1c1015-6a65-4473-ac34-d03761422bdf" xlink:to="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_NonVehicleRelatedDepreciationAndAmortization_9b70f9ea-3f18-42ac-83f1-77b964f5fd13" xlink:href="car-20250930.xsd#car_NonVehicleRelatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:to="loc_car_NonVehicleRelatedDepreciationAndAmortization_9b70f9ea-3f18-42ac-83f1-77b964f5fd13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_b47ea98e-dd42-470e-8b24-eee131c92a01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_b47ea98e-dd42-470e-8b24-eee131c92a01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_OtherFleetCharges_4b6c6f5f-771c-40b3-875b-02b8a2bb256b" xlink:href="car-20250930.xsd#car_OtherFleetCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:to="loc_car_OtherFleetCharges_4b6c6f5f-771c-40b3-875b-02b8a2bb256b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_a7441523-5cb4-46d9-a950-dcf4e9d9f87c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:to="loc_us-gaap_RestructuringCharges_a7441523-5cb4-46d9-a950-dcf4e9d9f87c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_TransactionRelatedCostsNet_9c719e3d-43b9-4383-830f-9a698ef8faa9" xlink:href="car-20250930.xsd#car_TransactionRelatedCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:to="loc_car_TransactionRelatedCostsNet_9c719e3d-43b9-4383-830f-9a698ef8faa9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_0f62a824-67a3-4efb-bed7-656bb25e40fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_0f62a824-67a3-4efb-bed7-656bb25e40fe" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_LegalMattersNetCloudComputingCostsAndSevereWeatherRelatedDamagesNet_a674aa7a-6403-45e9-81d9-583bcb5205bd" xlink:href="car-20250930.xsd#car_LegalMattersNetCloudComputingCostsAndSevereWeatherRelatedDamagesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:to="loc_car_LegalMattersNetCloudComputingCostsAndSevereWeatherRelatedDamagesNet_a674aa7a-6403-45e9-81d9-583bcb5205bd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_CorporateAndOthers_a914615b-4807-4ee8-8da4-955eb898b238" xlink:href="car-20250930.xsd#car_CorporateAndOthers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:to="loc_car_CorporateAndOthers_a914615b-4807-4ee8-8da4-955eb898b238" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_546f0c2e-9fd9-429a-8415-c92c6717ae1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_car_AdjustmentsToEBITDAAbstract_3238daf9-d8c1-4fda-8d5c-b5b5004637f2" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_546f0c2e-9fd9-429a-8415-c92c6717ae1d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_04f7a9c8-f3cb-4157-88a7-90e63cf170f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_fb1c1015-6a65-4473-ac34-d03761422bdf" xlink:to="loc_us-gaap_InterestExpense_04f7a9c8-f3cb-4157-88a7-90e63cf170f1" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.avis.com/role/SegmentInformationScheduleofSegmentAssetsDetails" xlink:type="simple" xlink:href="car-20250930.xsd#SegmentInformationScheduleofSegmentAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.avis.com/role/SegmentInformationScheduleofSegmentAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_91da5ae7-4dba-46ba-8416-aac99d666c57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_c90be571-f7dc-414f-995f-33d5ae0b69f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_91da5ae7-4dba-46ba-8416-aac99d666c57" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_c90be571-f7dc-414f-995f-33d5ae0b69f3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_7bcc948d-0cbf-4031-a249-46687b9a9543" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_c90be571-f7dc-414f-995f-33d5ae0b69f3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_7bcc948d-0cbf-4031-a249-46687b9a9543" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_7bcc948d-0cbf-4031-a249-46687b9a9543_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7bcc948d-0cbf-4031-a249-46687b9a9543" xlink:to="loc_us-gaap_SegmentDomain_7bcc948d-0cbf-4031-a249-46687b9a9543_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d457deda-801b-4b80-a6c5-ce204860342b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7bcc948d-0cbf-4031-a249-46687b9a9543" xlink:to="loc_us-gaap_SegmentDomain_d457deda-801b-4b80-a6c5-ce204860342b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AmericasSegmentMember_c84144c2-11d5-4279-83dc-ead48550ddeb" xlink:href="car-20250930.xsd#car_AmericasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d457deda-801b-4b80-a6c5-ce204860342b" xlink:to="loc_car_AmericasSegmentMember_c84144c2-11d5-4279-83dc-ead48550ddeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_InternationalMember_5c9972af-b997-4ab2-a63f-4cf50bd71d5f" xlink:href="car-20250930.xsd#car_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d457deda-801b-4b80-a6c5-ce204860342b" xlink:to="loc_car_InternationalMember_5c9972af-b997-4ab2-a63f-4cf50bd71d5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_UnallocatedAssetsSegmentMember_444914c9-f52b-4622-862a-78f9b6cbc187" xlink:href="car-20250930.xsd#car_UnallocatedAssetsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d457deda-801b-4b80-a6c5-ce204860342b" xlink:to="loc_car_UnallocatedAssetsSegmentMember_444914c9-f52b-4622-862a-78f9b6cbc187" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_2b55526a-b907-45b0-bd16-f2f942a5b7c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_91da5ae7-4dba-46ba-8416-aac99d666c57" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_2b55526a-b907-45b0-bd16-f2f942a5b7c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_SegmentAssetsExclusiveOfAssetsUnderVehicleProgram_b668e1e0-aca5-4f7d-b535-86b066c33d06" xlink:href="car-20250930.xsd#car_SegmentAssetsExclusiveOfAssetsUnderVehicleProgram"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_91da5ae7-4dba-46ba-8416-aac99d666c57" xlink:to="loc_car_SegmentAssetsExclusiveOfAssetsUnderVehicleProgram_b668e1e0-aca5-4f7d-b535-86b066c33d06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_car_AssetsUnderVehiclePrograms_f701fd3c-6d11-4285-9658-69631eba9b1a" xlink:href="car-20250930.xsd#car_AssetsUnderVehiclePrograms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_91da5ae7-4dba-46ba-8416-aac99d666c57" xlink:to="loc_car_AssetsUnderVehiclePrograms_f701fd3c-6d11-4285-9658-69631eba9b1a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_2eac8f36-e84e-4200-b699-b4a0c6e3db34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_91da5ae7-4dba-46ba-8416-aac99d666c57" xlink:to="loc_us-gaap_NoncurrentAssets_2eac8f36-e84e-4200-b699-b4a0c6e3db34" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
