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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:86c32d61-e34d-42cc-ab69-1b8c317f92d4,g:5c725247-d69a-4752-88fb-18c79b5c76bf-->
<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.mgmresorts.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="mgm-20250630.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" 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_7ea48a8f-d96e-4252-a63d-ce264a6e0ea2" 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_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_StatementTable_7ea48a8f-d96e-4252-a63d-ce264a6e0ea2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_3af4436a-0a58-46bb-b75a-ddc359823280" 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_StatementTable_7ea48a8f-d96e-4252-a63d-ce264a6e0ea2" xlink:to="loc_srt_ProductOrServiceAxis_3af4436a-0a58-46bb-b75a-ddc359823280" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3af4436a-0a58-46bb-b75a-ddc359823280_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_3af4436a-0a58-46bb-b75a-ddc359823280" xlink:to="loc_srt_ProductsAndServicesDomain_3af4436a-0a58-46bb-b75a-ddc359823280_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_58aba392-55bd-4161-933f-fe4d7c1cc5da" 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_3af4436a-0a58-46bb-b75a-ddc359823280" xlink:to="loc_srt_ProductsAndServicesDomain_58aba392-55bd-4161-933f-fe4d7c1cc5da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CasinoMember_921591a0-c4b9-4ea2-a995-53be04baa2ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CasinoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_58aba392-55bd-4161-933f-fe4d7c1cc5da" xlink:to="loc_us-gaap_CasinoMember_921591a0-c4b9-4ea2-a995-53be04baa2ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyMember_f26ab0f9-cb4d-409b-b2c7-66e63637fa9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OccupancyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_58aba392-55bd-4161-933f-fe4d7c1cc5da" xlink:to="loc_us-gaap_OccupancyMember_f26ab0f9-cb4d-409b-b2c7-66e63637fa9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FoodAndBeverageMember_d1352d35-0790-48c9-83cc-dd59d136d495" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FoodAndBeverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_58aba392-55bd-4161-933f-fe4d7c1cc5da" xlink:to="loc_us-gaap_FoodAndBeverageMember_d1352d35-0790-48c9-83cc-dd59d136d495" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_EntertainmentRetailAndOtherMember_29ac5167-b9c1-4872-aa21-59ac4b2bbc26" xlink:href="mgm-20250630.xsd#mgm_EntertainmentRetailAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_58aba392-55bd-4161-933f-fe4d7c1cc5da" xlink:to="loc_mgm_EntertainmentRetailAndOtherMember_29ac5167-b9c1-4872-aa21-59ac4b2bbc26" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_36568671-fb9d-4a05-9eb2-bcf53c3428ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerAbstract_36568671-fb9d-4a05-9eb2-bcf53c3428ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2f223c75-1bf3-4df0-aedf-39364f3dec1e" 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_RevenueFromContractWithCustomerAbstract_36568671-fb9d-4a05-9eb2-bcf53c3428ad" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2f223c75-1bf3-4df0-aedf-39364f3dec1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_e5d7a273-375c-4f75-bf6d-819564ecccd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_e5d7a273-375c-4f75-bf6d-819564ecccd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_64c7badc-150f-4870-b16d-5608ee7a85ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e5d7a273-375c-4f75-bf6d-819564ecccd3" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_64c7badc-150f-4870-b16d-5608ee7a85ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_2feafa9a-3cbc-4a5a-8e83-0bad47783ad3" 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_us-gaap_CostsAndExpensesAbstract_e5d7a273-375c-4f75-bf6d-819564ecccd3" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_2feafa9a-3cbc-4a5a-8e83-0bad47783ad3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_CorporateIncomeExpense_7486067e-1257-4dac-8aee-3a206fab861b" xlink:href="mgm-20250630.xsd#mgm_CorporateIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e5d7a273-375c-4f75-bf6d-819564ecccd3" xlink:to="loc_mgm_CorporateIncomeExpense_7486067e-1257-4dac-8aee-3a206fab861b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_PreopeningAndStartUpIncomeExpense_cbeef02e-72dd-471f-a8d6-c4bc9da6543a" xlink:href="mgm-20250630.xsd#mgm_PreopeningAndStartUpIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e5d7a273-375c-4f75-bf6d-819564ecccd3" xlink:to="loc_mgm_PreopeningAndStartUpIncomeExpense_cbeef02e-72dd-471f-a8d6-c4bc9da6543a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_PropertyTransactionsNet_5c10dd7d-223a-41ad-8cc3-75c20d586a47" xlink:href="mgm-20250630.xsd#mgm_PropertyTransactionsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e5d7a273-375c-4f75-bf6d-819564ecccd3" xlink:to="loc_mgm_PropertyTransactionsNet_5c10dd7d-223a-41ad-8cc3-75c20d586a47" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_920858e4-bbc5-4350-bb41-16d6500c21c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e5d7a273-375c-4f75-bf6d-819564ecccd3" xlink:to="loc_us-gaap_DepreciationAndAmortization_920858e4-bbc5-4350-bb41-16d6500c21c4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_3e348550-6fd3-459a-a5bd-93223ea9e9fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_e5d7a273-375c-4f75-bf6d-819564ecccd3" xlink:to="loc_us-gaap_CostsAndExpenses_3e348550-6fd3-459a-a5bd-93223ea9e9fb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_IncomeLossFromUnconsolidatedAffiliates_9b1c594b-dc30-4bab-843f-9137ac31309e" xlink:href="mgm-20250630.xsd#mgm_IncomeLossFromUnconsolidatedAffiliates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_mgm_IncomeLossFromUnconsolidatedAffiliates_9b1c594b-dc30-4bab-843f-9137ac31309e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_aef5f9f9-cae2-4a12-9405-3e3cefebbad4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_OperatingIncomeLoss_aef5f9f9-cae2-4a12-9405-3e3cefebbad4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68a684d6-cfa8-4cd3-969f-d5095c532d4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68a684d6-cfa8-4cd3-969f-d5095c532d4b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_b674f1c0-a859-4f8c-998e-961af4cadfbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68a684d6-cfa8-4cd3-969f-d5095c532d4b" xlink:to="loc_us-gaap_InterestExpenseNonoperating_b674f1c0-a859-4f8c-998e-961af4cadfbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_NonOperatingExpenseIncomeFromUnconsolidatedAffiliates_9483a461-ac53-4f71-a8a4-ab0429955843" xlink:href="mgm-20250630.xsd#mgm_NonOperatingExpenseIncomeFromUnconsolidatedAffiliates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68a684d6-cfa8-4cd3-969f-d5095c532d4b" xlink:to="loc_mgm_NonOperatingExpenseIncomeFromUnconsolidatedAffiliates_9483a461-ac53-4f71-a8a4-ab0429955843" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_b1d4c76e-4732-402b-a42e-b231da15b45a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68a684d6-cfa8-4cd3-969f-d5095c532d4b" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_b1d4c76e-4732-402b-a42e-b231da15b45a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_e5449eb6-8723-4ea5-8019-461de3206384" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68a684d6-cfa8-4cd3-969f-d5095c532d4b" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_e5449eb6-8723-4ea5-8019-461de3206384" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a2d49f8a-cdba-4594-918f-3c77865b5175" 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_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a2d49f8a-cdba-4594-918f-3c77865b5175" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_a0b5abab-bdc5-4df8-8c40-eb59502e0396" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_a0b5abab-bdc5-4df8-8c40-eb59502e0396" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_f6884cb3-49cb-4831-a2b5-a95ee7323a98" 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_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_ProfitLoss_f6884cb3-49cb-4831-a2b5-a95ee7323a98" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_7e394198-8842-4602-aff1-dc3f6751c81e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_7e394198-8842-4602-aff1-dc3f6751c81e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_e5a4ae03-64bd-4b90-b4c6-7bfff5189484" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_NetIncomeLoss_e5a4ae03-64bd-4b90-b4c6-7bfff5189484" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_4258c43f-12a2-4899-a786-8f08005df78d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_EarningsPerShareAbstract_4258c43f-12a2-4899-a786-8f08005df78d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_86e24010-a525-4b87-b8b6-be5f71500507" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_4258c43f-12a2-4899-a786-8f08005df78d" xlink:to="loc_us-gaap_EarningsPerShareBasic_86e24010-a525-4b87-b8b6-be5f71500507" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_84aedd3e-dbb8-438d-b505-022e8da9ef4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_4258c43f-12a2-4899-a786-8f08005df78d" xlink:to="loc_us-gaap_EarningsPerShareDiluted_84aedd3e-dbb8-438d-b505-022e8da9ef4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_24014ab8-96b4-4221-9fbb-e8164fc1b8c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c0e34a59-fcc4-463b-bd96-c7fc452f6ec6" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_24014ab8-96b4-4221-9fbb-e8164fc1b8c5" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_cdb666c1-5a16-42aa-9524-638f11338309" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_24014ab8-96b4-4221-9fbb-e8164fc1b8c5" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_cdb666c1-5a16-42aa-9524-638f11338309" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_7c3fbc9e-1c6d-4701-9df2-64c72e5ca7d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_24014ab8-96b4-4221-9fbb-e8164fc1b8c5" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_7c3fbc9e-1c6d-4701-9df2-64c72e5ca7d0" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="mgm-20250630.xsd#CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_bd193f8f-c852-4cdc-aaf6-1bc0ead6208a" 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_6dceb45c-d91a-46c3-b1d8-9cbdecb006ad" 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_bd193f8f-c852-4cdc-aaf6-1bc0ead6208a" xlink:to="loc_us-gaap_StatementTable_6dceb45c-d91a-46c3-b1d8-9cbdecb006ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_c7c372b1-75bf-4089-83e2-e9c3d4501f2b" 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_6dceb45c-d91a-46c3-b1d8-9cbdecb006ad" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_c7c372b1-75bf-4089-83e2-e9c3d4501f2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_c7c372b1-75bf-4089-83e2-e9c3d4501f2b_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_c7c372b1-75bf-4089-83e2-e9c3d4501f2b" xlink:to="loc_us-gaap_EquityComponentDomain_c7c372b1-75bf-4089-83e2-e9c3d4501f2b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_7b2862ae-bf24-4b08-b282-d7cc08632948" 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_c7c372b1-75bf-4089-83e2-e9c3d4501f2b" xlink:to="loc_us-gaap_EquityComponentDomain_7b2862ae-bf24-4b08-b282-d7cc08632948" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_ec1febe4-84fe-40d5-9264-ed1ba85b820e" 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_7b2862ae-bf24-4b08-b282-d7cc08632948" xlink:to="loc_us-gaap_ParentMember_ec1febe4-84fe-40d5-9264-ed1ba85b820e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_3c45facd-a26e-485a-8e5e-6fcf39b278d5" 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_ec1febe4-84fe-40d5-9264-ed1ba85b820e" xlink:to="loc_us-gaap_CommonStockMember_3c45facd-a26e-485a-8e5e-6fcf39b278d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_df90f9de-ed0b-4a7e-8e14-48209a11410c" 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_ec1febe4-84fe-40d5-9264-ed1ba85b820e" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_df90f9de-ed0b-4a7e-8e14-48209a11410c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_8c3910ba-35f6-4ff8-8427-b93f35b78959" 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_ec1febe4-84fe-40d5-9264-ed1ba85b820e" xlink:to="loc_us-gaap_RetainedEarningsMember_8c3910ba-35f6-4ff8-8427-b93f35b78959" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3aaa948c-316c-4252-980e-4c7956fbcd41" 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_ParentMember_ec1febe4-84fe-40d5-9264-ed1ba85b820e" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3aaa948c-316c-4252-980e-4c7956fbcd41" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_bb2fa5aa-143b-4195-b354-54a30df9a022" 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_7b2862ae-bf24-4b08-b282-d7cc08632948" xlink:to="loc_us-gaap_NoncontrollingInterestMember_bb2fa5aa-143b-4195-b354-54a30df9a022" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" 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_bd193f8f-c852-4cdc-aaf6-1bc0ead6208a" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_dc9e0337-059f-4e7f-b14c-a67967901ee4" 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_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_dc9e0337-059f-4e7f-b14c-a67967901ee4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2e83de8f-d483-4817-b5cc-aba1fba0ce4e" 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_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2e83de8f-d483-4817-b5cc-aba1fba0ce4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_476f4666-0336-4348-9715-688e34dfbf41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_476f4666-0336-4348-9715-688e34dfbf41" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_40aebdc9-6896-48fe-a05f-c8a5abedf3a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_40aebdc9-6896-48fe-a05f-c8a5abedf3a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_f099ed27-c118-4abf-b15c-a2e2959b9052" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_f099ed27-c118-4abf-b15c-a2e2959b9052" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_56b2ec72-dca3-4a37-973a-290e1b838267" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_56b2ec72-dca3-4a37-973a-290e1b838267" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_ba9e7de4-389d-444d-bceb-fc9c31e978ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_ba9e7de4-389d-444d-bceb-fc9c31e978ee" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_8990ffb9-939c-4232-b746-1fd6f2b0589d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_8990ffb9-939c-4232-b746-1fd6f2b0589d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_61eb4052-e7a2-407a-a4bd-1930727b7bc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_61eb4052-e7a2-407a-a4bd-1930727b7bc0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_ff98b18e-660f-4de9-89a0-59506691217d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_ff98b18e-660f-4de9-89a0-59506691217d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestChangeInRedemptionValue_ae12bf89-df25-4134-aaae-ec6d2fc56e08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestChangeInRedemptionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_MinorityInterestChangeInRedemptionValue_ae12bf89-df25-4134-aaae-ec6d2fc56e08" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_4854dcfe-421d-4583-acd3-8d105311f1f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0737f2de-4961-4411-ae79-a1eb7ecf30e3" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_4854dcfe-421d-4583-acd3-8d105311f1f1" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_1dafd03d-91db-415d-bf3b-77ce5a8d2124" 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_5f012823-9a72-423a-8a0a-19085255cb21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/ORGANIZATIONDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#ORGANIZATIONDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/ORGANIZATIONDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_mgm_OrganizationDisclosureLineItems_08d1e96e-eeb2-45be-817e-4c0f2fc0b5f1" xlink:href="mgm-20250630.xsd#mgm_OrganizationDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_OrganizationDisclosureTable_cc4d2410-ef19-421b-9397-b05ddcefaa94" xlink:href="mgm-20250630.xsd#mgm_OrganizationDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mgm_OrganizationDisclosureLineItems_08d1e96e-eeb2-45be-817e-4c0f2fc0b5f1" xlink:to="loc_mgm_OrganizationDisclosureTable_cc4d2410-ef19-421b-9397-b05ddcefaa94" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_65a28dee-3c9c-4f64-8d72-93a5071e3cc5" 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_mgm_OrganizationDisclosureTable_cc4d2410-ef19-421b-9397-b05ddcefaa94" xlink:to="loc_srt_OwnershipAxis_65a28dee-3c9c-4f64-8d72-93a5071e3cc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_65a28dee-3c9c-4f64-8d72-93a5071e3cc5_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_65a28dee-3c9c-4f64-8d72-93a5071e3cc5" xlink:to="loc_srt_OwnershipDomain_65a28dee-3c9c-4f64-8d72-93a5071e3cc5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_37f136e4-cfcc-4e86-8704-b79e085e9995" 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_65a28dee-3c9c-4f64-8d72-93a5071e3cc5" xlink:to="loc_srt_OwnershipDomain_37f136e4-cfcc-4e86-8704-b79e085e9995" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaHoldingsLimitedMember_65ac4885-68e4-4ef7-976a-b3555de46af3" xlink:href="mgm-20250630.xsd#mgm_MGMChinaHoldingsLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_37f136e4-cfcc-4e86-8704-b79e085e9995" xlink:to="loc_mgm_MGMChinaHoldingsLimitedMember_65ac4885-68e4-4ef7-976a-b3555de46af3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_22f8ba9a-db6a-4eb9-b7e1-6d0a30cb1f33" 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_mgm_OrganizationDisclosureTable_cc4d2410-ef19-421b-9397-b05ddcefaa94" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_22f8ba9a-db6a-4eb9-b7e1-6d0a30cb1f33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_22f8ba9a-db6a-4eb9-b7e1-6d0a30cb1f33_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_22f8ba9a-db6a-4eb9-b7e1-6d0a30cb1f33" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_22f8ba9a-db6a-4eb9-b7e1-6d0a30cb1f33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_33eef86a-3080-4982-ac31-02de0d41c998" 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_22f8ba9a-db6a-4eb9-b7e1-6d0a30cb1f33" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_33eef86a-3080-4982-ac31-02de0d41c998" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_BetMGMNorthAmericanVentureMember_1020f5fb-793b-4ad5-aa9b-2f19bc1272d9" xlink:href="mgm-20250630.xsd#mgm_BetMGMNorthAmericanVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_33eef86a-3080-4982-ac31-02de0d41c998" xlink:to="loc_mgm_BetMGMNorthAmericanVentureMember_1020f5fb-793b-4ad5-aa9b-2f19bc1272d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMOsakaCorporationMember_64e92607-166e-4d85-be87-fcbc597ce986" xlink:href="mgm-20250630.xsd#mgm_MGMOsakaCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_33eef86a-3080-4982-ac31-02de0d41c998" xlink:to="loc_mgm_MGMOsakaCorporationMember_64e92607-166e-4d85-be87-fcbc597ce986" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOwnershipInterestsByNameAxis_55eda8c7-8283-4c3a-b44b-aed56fcfe6ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOwnershipInterestsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mgm_OrganizationDisclosureTable_cc4d2410-ef19-421b-9397-b05ddcefaa94" xlink:to="loc_us-gaap_OtherOwnershipInterestsByNameAxis_55eda8c7-8283-4c3a-b44b-aed56fcfe6ba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOwnershipInterestsNameDomain_55eda8c7-8283-4c3a-b44b-aed56fcfe6ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOwnershipInterestsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherOwnershipInterestsByNameAxis_55eda8c7-8283-4c3a-b44b-aed56fcfe6ba" xlink:to="loc_us-gaap_OtherOwnershipInterestsNameDomain_55eda8c7-8283-4c3a-b44b-aed56fcfe6ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOwnershipInterestsNameDomain_679c9d42-fb63-429d-bd0f-81a0a56de164" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOwnershipInterestsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherOwnershipInterestsByNameAxis_55eda8c7-8283-4c3a-b44b-aed56fcfe6ba" xlink:to="loc_us-gaap_OtherOwnershipInterestsNameDomain_679c9d42-fb63-429d-bd0f-81a0a56de164" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_EntainPLCMember_5d799e58-bea7-423d-9f9d-1607e51b7995" xlink:href="mgm-20250630.xsd#mgm_EntainPLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherOwnershipInterestsNameDomain_679c9d42-fb63-429d-bd0f-81a0a56de164" xlink:to="loc_mgm_EntainPLCMember_5d799e58-bea7-423d-9f9d-1607e51b7995" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_21d813bd-1d07-4d3c-ac47-1b7c7005cc53" 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_mgm_OrganizationDisclosureTable_cc4d2410-ef19-421b-9397-b05ddcefaa94" xlink:to="loc_srt_StatementGeographicalAxis_21d813bd-1d07-4d3c-ac47-1b7c7005cc53" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_21d813bd-1d07-4d3c-ac47-1b7c7005cc53_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_21d813bd-1d07-4d3c-ac47-1b7c7005cc53" xlink:to="loc_srt_SegmentGeographicalDomain_21d813bd-1d07-4d3c-ac47-1b7c7005cc53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_b3cc8a7e-552e-4864-a679-2ad9cfed98cb" 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_21d813bd-1d07-4d3c-ac47-1b7c7005cc53" xlink:to="loc_srt_SegmentGeographicalDomain_b3cc8a7e-552e-4864-a679-2ad9cfed98cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_JP_c2060d6c-227b-4ded-98ef-c154bdae7da7" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_JP"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_b3cc8a7e-552e-4864-a679-2ad9cfed98cb" xlink:to="loc_country_JP_c2060d6c-227b-4ded-98ef-c154bdae7da7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction_0a738e6c-cdf3-4bb6-8514-3b17825b698a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_OrganizationDisclosureLineItems_08d1e96e-eeb2-45be-817e-4c0f2fc0b5f1" xlink:to="loc_us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction_0a738e6c-cdf3-4bb6-8514-3b17825b698a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_NumberOfIntegratedCasinoHotelAndEntertainmentResorts_dc2c0774-f72f-4aad-bde3-8827da42125b" xlink:href="mgm-20250630.xsd#mgm_NumberOfIntegratedCasinoHotelAndEntertainmentResorts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_OrganizationDisclosureLineItems_08d1e96e-eeb2-45be-817e-4c0f2fc0b5f1" xlink:to="loc_mgm_NumberOfIntegratedCasinoHotelAndEntertainmentResorts_dc2c0774-f72f-4aad-bde3-8827da42125b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_82edbb01-e6a2-4ece-83d2-cdaee1c79e99" 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_mgm_OrganizationDisclosureLineItems_08d1e96e-eeb2-45be-817e-4c0f2fc0b5f1" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_82edbb01-e6a2-4ece-83d2-cdaee1c79e99" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_4a0ad57b-b8af-48b3-8e9b-2e0a398a0d53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_OrganizationDisclosureLineItems_08d1e96e-eeb2-45be-817e-4c0f2fc0b5f1" xlink:to="loc_us-gaap_NumberOfReportableSegments_4a0ad57b-b8af-48b3-8e9b-2e0a398a0d53" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:href="mgm-20250630.xsd#mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_b070595a-863d-4158-bb33-0eaa91e9a628" xlink:href="mgm-20250630.xsd#mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_b070595a-863d-4158-bb33-0eaa91e9a628" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_16b16e2f-0308-4613-bbd3-a49a207fcc0e" 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_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_b070595a-863d-4158-bb33-0eaa91e9a628" xlink:to="loc_srt_OwnershipAxis_16b16e2f-0308-4613-bbd3-a49a207fcc0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_16b16e2f-0308-4613-bbd3-a49a207fcc0e_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_16b16e2f-0308-4613-bbd3-a49a207fcc0e" xlink:to="loc_srt_OwnershipDomain_16b16e2f-0308-4613-bbd3-a49a207fcc0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_60227141-6ffc-49a0-ae6b-af99fba0ba02" 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_16b16e2f-0308-4613-bbd3-a49a207fcc0e" xlink:to="loc_srt_OwnershipDomain_60227141-6ffc-49a0-ae6b-af99fba0ba02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_BellagioREITVentureMember_3c4865e2-bfc9-4a3a-a276-d92d44f2ee7c" xlink:href="mgm-20250630.xsd#mgm_BellagioREITVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_60227141-6ffc-49a0-ae6b-af99fba0ba02" xlink:to="loc_mgm_BellagioREITVentureMember_3c4865e2-bfc9-4a3a-a276-d92d44f2ee7c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_405b5885-f65f-4f72-a749-0fd8e6d3a32b" 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_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_b070595a-863d-4158-bb33-0eaa91e9a628" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_405b5885-f65f-4f72-a749-0fd8e6d3a32b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_405b5885-f65f-4f72-a749-0fd8e6d3a32b_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_405b5885-f65f-4f72-a749-0fd8e6d3a32b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_405b5885-f65f-4f72-a749-0fd8e6d3a32b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_d181e6e3-2405-484e-a621-b271a88a3ff9" 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_405b5885-f65f-4f72-a749-0fd8e6d3a32b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_d181e6e3-2405-484e-a621-b271a88a3ff9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_e771983c-f2a9-48dd-93c4-de8ca302bd3a" 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_d181e6e3-2405-484e-a621-b271a88a3ff9" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_e771983c-f2a9-48dd-93c4-de8ca302bd3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_82c8af59-ce84-46dd-a01b-686da31602e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_b070595a-863d-4158-bb33-0eaa91e9a628" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_82c8af59-ce84-46dd-a01b-686da31602e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_82c8af59-ce84-46dd-a01b-686da31602e6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_82c8af59-ce84-46dd-a01b-686da31602e6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_82c8af59-ce84-46dd-a01b-686da31602e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a7972564-2225-48c1-9a09-7edbb2fd3344" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_82c8af59-ce84-46dd-a01b-686da31602e6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a7972564-2225-48c1-9a09-7edbb2fd3344" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMGrandParadiseSAMember_37006ed1-92c0-4e80-98d1-42c88fa3b6ba" xlink:href="mgm-20250630.xsd#mgm_MGMGrandParadiseSAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a7972564-2225-48c1-9a09-7edbb2fd3344" xlink:to="loc_mgm_MGMGrandParadiseSAMember_37006ed1-92c0-4e80-98d1-42c88fa3b6ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfArrangementAxis_040e06fe-e7eb-4610-9a08-8d7b0016563c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfArrangementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_b070595a-863d-4158-bb33-0eaa91e9a628" xlink:to="loc_us-gaap_TypeOfArrangementAxis_040e06fe-e7eb-4610-9a08-8d7b0016563c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_040e06fe-e7eb-4610-9a08-8d7b0016563c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TypeOfArrangementAxis_040e06fe-e7eb-4610-9a08-8d7b0016563c" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_040e06fe-e7eb-4610-9a08-8d7b0016563c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_d41ac184-3523-4689-b649-f4185bd84199" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TypeOfArrangementAxis_040e06fe-e7eb-4610-9a08-8d7b0016563c" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_d41ac184-3523-4689-b649-f4185bd84199" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_June2022SubConcessionExtensionContractMember_0c383831-aa8b-47d2-9d36-1fff513a6bbe" xlink:href="mgm-20250630.xsd#mgm_June2022SubConcessionExtensionContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_d41ac184-3523-4689-b649-f4185bd84199" xlink:to="loc_mgm_June2022SubConcessionExtensionContractMember_0c383831-aa8b-47d2-9d36-1fff513a6bbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_7c4bc829-b4bc-4254-856d-2f6bf13f2d5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_b070595a-863d-4158-bb33-0eaa91e9a628" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_7c4bc829-b4bc-4254-856d-2f6bf13f2d5f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_7c4bc829-b4bc-4254-856d-2f6bf13f2d5f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_7c4bc829-b4bc-4254-856d-2f6bf13f2d5f" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_7c4bc829-b4bc-4254-856d-2f6bf13f2d5f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_d578c80c-721d-4eb1-87b3-3956652f8483" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_7c4bc829-b4bc-4254-856d-2f6bf13f2d5f" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_d578c80c-721d-4eb1-87b3-3956652f8483" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_FoodAndBeverageRevenueMember_643cd8d8-dbf7-4b25-88c3-0fe1aa1d536e" xlink:href="mgm-20250630.xsd#mgm_FoodAndBeverageRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_d578c80c-721d-4eb1-87b3-3956652f8483" xlink:to="loc_mgm_FoodAndBeverageRevenueMember_643cd8d8-dbf7-4b25-88c3-0fe1aa1d536e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_EntertainmentRetailAndOtherRevenueMember_66f575bf-71aa-411c-8e80-db938b70f039" xlink:href="mgm-20250630.xsd#mgm_EntertainmentRetailAndOtherRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_d578c80c-721d-4eb1-87b3-3956652f8483" xlink:to="loc_mgm_EntertainmentRetailAndOtherRevenueMember_66f575bf-71aa-411c-8e80-db938b70f039" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_60fe3628-c44b-4348-be63-0d522eb47d9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_60fe3628-c44b-4348-be63-0d522eb47d9c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_PercentageOfOwnershipInterest_b9cf3ce7-704c-4483-8012-394c0a25667e" xlink:href="mgm-20250630.xsd#mgm_PercentageOfOwnershipInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_mgm_PercentageOfOwnershipInterest_b9cf3ce7-704c-4483-8012-394c0a25667e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_17fa2d3b-1b35-48f9-bb5a-35be61e4c067" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_17fa2d3b-1b35-48f9-bb5a-35be61e4c067" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_7b90b1f0-1451-48c2-9d7c-d0e07e09ded3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_7b90b1f0-1451-48c2-9d7c-d0e07e09ded3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_bb1364bf-b2b9-49da-a7fd-f6e051e360c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_DerivativeAssets_bb1364bf-b2b9-49da-a7fd-f6e051e360c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsCurrent_46b39136-d60a-46ef-afac-573203805a94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_DerivativeAssetsCurrent_46b39136-d60a-46ef-afac-573203805a94" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsNoncurrent_e91f797c-3e3a-4ca0-94bb-c5c6b3ed6905" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_DerivativeAssetsNoncurrent_e91f797c-3e3a-4ca0-94bb-c5c6b3ed6905" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_bd1fe155-5f17-4dee-b63b-582c1cf5cd02" 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_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_DerivativeLiabilities_bd1fe155-5f17-4dee-b63b-582c1cf5cd02" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesCurrent_28fd8129-03c4-4187-bd01-bb7d62c0b6dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_DerivativeLiabilitiesCurrent_28fd8129-03c4-4187-bd01-bb7d62c0b6dc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesNoncurrent_39abde39-9c01-49dd-9d5e-f11c3ae80646" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_DerivativeLiabilitiesNoncurrent_39abde39-9c01-49dd-9d5e-f11c3ae80646" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_21662a45-4a73-4e98-bf93-6edec4e6ad58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_21662a45-4a73-4e98-bf93-6edec4e6ad58" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_895efb2a-88f6-4454-924d-21c48aa44a15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_895efb2a-88f6-4454-924d-21c48aa44a15" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_8c32b49d-a690-4ef9-9e06-4781900ad552" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_8c32b49d-a690-4ef9-9e06-4781900ad552" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_AccruedCapitalExpenditures_9f1503bb-e390-4d89-9056-613bc4e10123" xlink:href="mgm-20250630.xsd#mgm_AccruedCapitalExpenditures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_mgm_AccruedCapitalExpenditures_9f1503bb-e390-4d89-9056-613bc4e10123" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseIncome_4a19594b-640f-4765-bad7-073835a58645" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_f6853000-ed56-4a4a-9f32-572d65d28cb1" xlink:to="loc_us-gaap_LeaseIncome_4a19594b-640f-4765-bad7-073835a58645" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESScheduleofDebtInvestmentsDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESScheduleofDebtInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESScheduleofDebtInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_0f50fdd5-ae8f-4450-a79b-a77f6ffc3021" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_e719e307-d598-42d3-9f2a-b177201a61c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_0f50fdd5-ae8f-4450-a79b-a77f6ffc3021" xlink:to="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_e719e307-d598-42d3-9f2a-b177201a61c7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_c38426d5-f909-4a8a-ac08-c6d746d9d5b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_e719e307-d598-42d3-9f2a-b177201a61c7" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_c38426d5-f909-4a8a-ac08-c6d746d9d5b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_c38426d5-f909-4a8a-ac08-c6d746d9d5b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_c38426d5-f909-4a8a-ac08-c6d746d9d5b7" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_c38426d5-f909-4a8a-ac08-c6d746d9d5b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_fbdde147-839d-4c5f-b3ff-11560772149e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_c38426d5-f909-4a8a-ac08-c6d746d9d5b7" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_fbdde147-839d-4c5f-b3ff-11560772149e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_c96fb32f-5600-4f5c-970c-123d83be93f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_fbdde147-839d-4c5f-b3ff-11560772149e" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_c96fb32f-5600-4f5c-970c-123d83be93f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_fffca6a9-1148-471e-8ce7-2e1c24d75cd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_fbdde147-839d-4c5f-b3ff-11560772149e" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_fffca6a9-1148-471e-8ce7-2e1c24d75cd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e6871589-4aa8-45c1-8656-42537b71bda5" 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_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_e719e307-d598-42d3-9f2a-b177201a61c7" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e6871589-4aa8-45c1-8656-42537b71bda5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e6871589-4aa8-45c1-8656-42537b71bda5_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_e6871589-4aa8-45c1-8656-42537b71bda5" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e6871589-4aa8-45c1-8656-42537b71bda5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e85962c8-1cb4-4a17-b886-9eef87cadfd4" 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_e6871589-4aa8-45c1-8656-42537b71bda5" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e85962c8-1cb4-4a17-b886-9eef87cadfd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_f4f84004-71df-4c9b-8e42-70e709a16422" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e85962c8-1cb4-4a17-b886-9eef87cadfd4" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_f4f84004-71df-4c9b-8e42-70e709a16422" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_2ab978e2-ea73-4cf7-a45c-685c22bc88a4" 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_e85962c8-1cb4-4a17-b886-9eef87cadfd4" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_2ab978e2-ea73-4cf7-a45c-685c22bc88a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_5bde3734-7df7-4b9d-a51b-b448a84656c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_e719e307-d598-42d3-9f2a-b177201a61c7" xlink:to="loc_us-gaap_FinancialInstrumentAxis_5bde3734-7df7-4b9d-a51b-b448a84656c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_5bde3734-7df7-4b9d-a51b-b448a84656c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_5bde3734-7df7-4b9d-a51b-b448a84656c9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_5bde3734-7df7-4b9d-a51b-b448a84656c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_536d8e94-953b-43f8-966e-481bf007dde5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_5bde3734-7df7-4b9d-a51b-b448a84656c9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_536d8e94-953b-43f8-966e-481bf007dde5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_268b1dc9-0ac1-4c1a-8c7e-672b74e8b5ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_536d8e94-953b-43f8-966e-481bf007dde5" xlink:to="loc_us-gaap_MoneyMarketFundsMember_268b1dc9-0ac1-4c1a-8c7e-672b74e8b5ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentDebtSecuritiesMember_13a78f53-f511-4c81-8849-95254616069e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_536d8e94-953b-43f8-966e-481bf007dde5" xlink:to="loc_us-gaap_USGovernmentDebtSecuritiesMember_13a78f53-f511-4c81-8849-95254616069e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_e783b687-4713-473b-adae-996540132d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_536d8e94-953b-43f8-966e-481bf007dde5" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_e783b687-4713-473b-adae-996540132d9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_7f6d0711-916b-4c03-bc21-9f6c23364e6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_536d8e94-953b-43f8-966e-481bf007dde5" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_7f6d0711-916b-4c03-bc21-9f6c23364e6e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecurities_bf6deffd-b9b5-4fbd-a108-913df4b9e244" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_0f50fdd5-ae8f-4450-a79b-a77f6ffc3021" xlink:to="loc_us-gaap_DebtSecurities_bf6deffd-b9b5-4fbd-a108-913df4b9e244" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESScheduleofContractandContractrelatedLiabilitiesDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESScheduleofContractandContractrelatedLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESScheduleofContractandContractrelatedLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_mgm_ContractAndContractRelatedLiabilitiesLineItems_dd129172-c61b-4ef1-a5bd-27dfca7c6a34" xlink:href="mgm-20250630.xsd#mgm_ContractAndContractRelatedLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_ContractAndContractRelatedLiabilitiesTable_a772c0a2-6340-45b0-beb3-ce4865267ea2" xlink:href="mgm-20250630.xsd#mgm_ContractAndContractRelatedLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mgm_ContractAndContractRelatedLiabilitiesLineItems_dd129172-c61b-4ef1-a5bd-27dfca7c6a34" xlink:to="loc_mgm_ContractAndContractRelatedLiabilitiesTable_a772c0a2-6340-45b0-beb3-ce4865267ea2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_bd1f6a1f-719b-4e25-8ed5-b4d876f5e8c9" 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_mgm_ContractAndContractRelatedLiabilitiesTable_a772c0a2-6340-45b0-beb3-ce4865267ea2" xlink:to="loc_srt_ProductOrServiceAxis_bd1f6a1f-719b-4e25-8ed5-b4d876f5e8c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bd1f6a1f-719b-4e25-8ed5-b4d876f5e8c9_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_bd1f6a1f-719b-4e25-8ed5-b4d876f5e8c9" xlink:to="loc_srt_ProductsAndServicesDomain_bd1f6a1f-719b-4e25-8ed5-b4d876f5e8c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_31e12d36-eed8-4d07-a60e-08376fd68023" 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_bd1f6a1f-719b-4e25-8ed5-b4d876f5e8c9" xlink:to="loc_srt_ProductsAndServicesDomain_31e12d36-eed8-4d07-a60e-08376fd68023" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_OutstandingChipLiabilityMember_e8576a89-199b-4890-8446-bf3f997fc161" xlink:href="mgm-20250630.xsd#mgm_OutstandingChipLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_31e12d36-eed8-4d07-a60e-08376fd68023" xlink:to="loc_mgm_OutstandingChipLiabilityMember_e8576a89-199b-4890-8446-bf3f997fc161" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_LoyaltyProgramMember_f63b0e6e-a391-47fe-b626-b2f74cb9d3ff" xlink:href="mgm-20250630.xsd#mgm_LoyaltyProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_31e12d36-eed8-4d07-a60e-08376fd68023" xlink:to="loc_mgm_LoyaltyProgramMember_f63b0e6e-a391-47fe-b626-b2f74cb9d3ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_CustomerAdvancesAndOtherMember_b7d59736-21ad-4425-8842-a2dd7c710ffc" xlink:href="mgm-20250630.xsd#mgm_CustomerAdvancesAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_31e12d36-eed8-4d07-a60e-08376fd68023" xlink:to="loc_mgm_CustomerAdvancesAndOtherMember_b7d59736-21ad-4425-8842-a2dd7c710ffc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_ContractAndContractRelatedLiabilitiesRollForward_d1e8ab97-a184-4e87-a041-a37205ecd307" xlink:href="mgm-20250630.xsd#mgm_ContractAndContractRelatedLiabilitiesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_ContractAndContractRelatedLiabilitiesLineItems_dd129172-c61b-4ef1-a5bd-27dfca7c6a34" xlink:to="loc_mgm_ContractAndContractRelatedLiabilitiesRollForward_d1e8ab97-a184-4e87-a041-a37205ecd307" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_de748659-c080-4721-9d8f-447adb4bb47d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_ContractAndContractRelatedLiabilitiesRollForward_d1e8ab97-a184-4e87-a041-a37205ecd307" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_de748659-c080-4721-9d8f-447adb4bb47d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_e61fd85e-dca9-4a6c-8f3a-c03148fcd8a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_ChangeInContractAndContractRelatedLiabilities_b626e075-b9bc-44cb-8754-4efdd6e46912" xlink:href="mgm-20250630.xsd#mgm_ChangeInContractAndContractRelatedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_ContractAndContractRelatedLiabilitiesRollForward_d1e8ab97-a184-4e87-a041-a37205ecd307" xlink:to="loc_mgm_ChangeInContractAndContractRelatedLiabilities_b626e075-b9bc-44cb-8754-4efdd6e46912" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/INVESTMENTSINANDADVANCESTOUNCONSOLIDATEDAFFILIATESAdditionalInformationDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#INVESTMENTSINANDADVANCESTOUNCONSOLIDATEDAFFILIATESAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/INVESTMENTSINANDADVANCESTOUNCONSOLIDATEDAFFILIATESAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_5f78d798-933b-4627-85e3-3e5cdda587dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_e7052387-a243-4913-9464-41a655ad331a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_5f78d798-933b-4627-85e3-3e5cdda587dd" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_e7052387-a243-4913-9464-41a655ad331a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_822f8011-b1e9-429b-99bd-0a31a0ab584e" 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_ScheduleOfEquityMethodInvestmentsTable_e7052387-a243-4913-9464-41a655ad331a" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_822f8011-b1e9-429b-99bd-0a31a0ab584e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_822f8011-b1e9-429b-99bd-0a31a0ab584e_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_822f8011-b1e9-429b-99bd-0a31a0ab584e" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_822f8011-b1e9-429b-99bd-0a31a0ab584e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_c072a355-edca-41ae-add6-cf0c96cac23b" 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_822f8011-b1e9-429b-99bd-0a31a0ab584e" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_c072a355-edca-41ae-add6-cf0c96cac23b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_BetMGMNorthAmericanVentureMember_d67ec7bb-d7fe-4712-a188-914cc88ba14e" xlink:href="mgm-20250630.xsd#mgm_BetMGMNorthAmericanVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_c072a355-edca-41ae-add6-cf0c96cac23b" xlink:to="loc_mgm_BetMGMNorthAmericanVentureMember_d67ec7bb-d7fe-4712-a188-914cc88ba14e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_aa074753-1f5c-4cee-9716-1ab5c55d6061" 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_ScheduleOfEquityMethodInvestmentsLineItems_5f78d798-933b-4627-85e3-3e5cdda587dd" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_aa074753-1f5c-4cee-9716-1ab5c55d6061" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_252760ed-cbc6-405b-850b-9ffbf2520e91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_5f78d798-933b-4627-85e3-3e5cdda587dd" xlink:to="loc_us-gaap_EquityMethodInvestments_252760ed-cbc6-405b-850b-9ffbf2520e91" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/INVESTMENTSINANDADVANCESTOUNCONSOLIDATEDAFFILIATESScheduleofShareofOperatingIncomeLossfromUnconsolidatedAffiliatesDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#INVESTMENTSINANDADVANCESTOUNCONSOLIDATEDAFFILIATESScheduleofShareofOperatingIncomeLossfromUnconsolidatedAffiliatesDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/INVESTMENTSINANDADVANCESTOUNCONSOLIDATEDAFFILIATESScheduleofShareofOperatingIncomeLossfromUnconsolidatedAffiliatesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_0433d5a8-e888-4fbb-a621-d1d7342cc9e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_8ef434b1-7c09-4e07-94b3-b99b62925cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_0433d5a8-e888-4fbb-a621-d1d7342cc9e5" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_8ef434b1-7c09-4e07-94b3-b99b62925cd3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_038e50f4-da40-4eba-8e6f-692ab11df8ba" 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_ScheduleOfEquityMethodInvestmentsTable_8ef434b1-7c09-4e07-94b3-b99b62925cd3" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_038e50f4-da40-4eba-8e6f-692ab11df8ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_038e50f4-da40-4eba-8e6f-692ab11df8ba_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_038e50f4-da40-4eba-8e6f-692ab11df8ba" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_038e50f4-da40-4eba-8e6f-692ab11df8ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_1416397e-29e2-4876-b79b-191897443dc3" 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_038e50f4-da40-4eba-8e6f-692ab11df8ba" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_1416397e-29e2-4876-b79b-191897443dc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_BetMGMNorthAmericanVentureMember_5bd9bc54-4592-4908-9008-555eae6aec2d" xlink:href="mgm-20250630.xsd#mgm_BetMGMNorthAmericanVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_1416397e-29e2-4876-b79b-191897443dc3" xlink:to="loc_mgm_BetMGMNorthAmericanVentureMember_5bd9bc54-4592-4908-9008-555eae6aec2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_OtherUnconsolidatedAffiliatesMember_61f5b2b1-ce15-4859-8418-56f1a490d1e1" xlink:href="mgm-20250630.xsd#mgm_OtherUnconsolidatedAffiliatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_1416397e-29e2-4876-b79b-191897443dc3" xlink:to="loc_mgm_OtherUnconsolidatedAffiliatesMember_61f5b2b1-ce15-4859-8418-56f1a490d1e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_IncomeLossFromUnconsolidatedAffiliates_c8c57e6c-ca58-461b-ad4b-f54fe026becc" xlink:href="mgm-20250630.xsd#mgm_IncomeLossFromUnconsolidatedAffiliates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_0433d5a8-e888-4fbb-a621-d1d7342cc9e5" xlink:to="loc_mgm_IncomeLossFromUnconsolidatedAffiliates_c8c57e6c-ca58-461b-ad4b-f54fe026becc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/LONGTERMDEBTScheduleofLongtermDebtDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#LONGTERMDEBTScheduleofLongtermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/LONGTERMDEBTScheduleofLongtermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_97b1f3f3-2298-442f-8b5a-0c9e3cff734c" 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_24326d47-558d-404e-880c-092b881e4e35" 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_97b1f3f3-2298-442f-8b5a-0c9e3cff734c" xlink:to="loc_us-gaap_DebtInstrumentTable_24326d47-558d-404e-880c-092b881e4e35" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_3eb5aed9-1a2d-4fca-afe8-407770643d62" 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_24326d47-558d-404e-880c-092b881e4e35" xlink:to="loc_us-gaap_CreditFacilityAxis_3eb5aed9-1a2d-4fca-afe8-407770643d62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_3eb5aed9-1a2d-4fca-afe8-407770643d62_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_3eb5aed9-1a2d-4fca-afe8-407770643d62" xlink:to="loc_us-gaap_CreditFacilityDomain_3eb5aed9-1a2d-4fca-afe8-407770643d62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_6ca18874-9bcd-43e6-8268-a44c278db334" 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_3eb5aed9-1a2d-4fca-afe8-407770643d62" xlink:to="loc_us-gaap_CreditFacilityDomain_6ca18874-9bcd-43e6-8268-a44c278db334" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaRevolvingCreditFacilityMember_af4cee84-8d4a-409e-8f23-6dde6e84b83f" xlink:href="mgm-20250630.xsd#mgm_MGMChinaRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_6ca18874-9bcd-43e6-8268-a44c278db334" xlink:to="loc_mgm_MGMChinaRevolvingCreditFacilityMember_af4cee84-8d4a-409e-8f23-6dde6e84b83f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaFirstCreditFacilityMember_5290a0b2-f90b-447e-86c1-491babaf4b51" xlink:href="mgm-20250630.xsd#mgm_MGMChinaFirstCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_6ca18874-9bcd-43e6-8268-a44c278db334" xlink:to="loc_mgm_MGMChinaFirstCreditFacilityMember_5290a0b2-f90b-447e-86c1-491babaf4b51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_6861524f-eb0f-4c5c-ab6c-cd4563985cfc" 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_24326d47-558d-404e-880c-092b881e4e35" xlink:to="loc_us-gaap_DebtInstrumentAxis_6861524f-eb0f-4c5c-ab6c-cd4563985cfc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6861524f-eb0f-4c5c-ab6c-cd4563985cfc_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_6861524f-eb0f-4c5c-ab6c-cd4563985cfc" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6861524f-eb0f-4c5c-ab6c-cd4563985cfc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" 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_6861524f-eb0f-4c5c-ab6c-cd4563985cfc" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaSeniorNotesDue2025Member_f6e981ee-e220-4d3c-8de8-36ec20ea3ed1" xlink:href="mgm-20250630.xsd#mgm_MGMChinaSeniorNotesDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:to="loc_mgm_MGMChinaSeniorNotesDue2025Member_f6e981ee-e220-4d3c-8de8-36ec20ea3ed1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaSeniorNotesDue2026Member_e2db4d25-9f52-4dc9-86a5-295d82cdcd30" xlink:href="mgm-20250630.xsd#mgm_MGMChinaSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:to="loc_mgm_MGMChinaSeniorNotesDue2026Member_e2db4d25-9f52-4dc9-86a5-295d82cdcd30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_SeniorNotesDue2026Member_44e41abe-ac24-40a2-b947-fe910bbab064" xlink:href="mgm-20250630.xsd#mgm_SeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:to="loc_mgm_SeniorNotesDue2026Member_44e41abe-ac24-40a2-b947-fe910bbab064" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_SeniorNotesDue2027Member_c2e266f4-b460-4856-913e-d7c0fcc24b3b" xlink:href="mgm-20250630.xsd#mgm_SeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:to="loc_mgm_SeniorNotesDue2027Member_c2e266f4-b460-4856-913e-d7c0fcc24b3b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaSeniorNotesDue2027Member_a2dfa80c-e164-4096-8345-53950ccb0665" xlink:href="mgm-20250630.xsd#mgm_MGMChinaSeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:to="loc_mgm_MGMChinaSeniorNotesDue2027Member_a2dfa80c-e164-4096-8345-53950ccb0665" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_SeniorNotesDue2028Member_2e0a96fb-aa9a-496c-b984-ec4a11ad17cc" xlink:href="mgm-20250630.xsd#mgm_SeniorNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:to="loc_mgm_SeniorNotesDue2028Member_2e0a96fb-aa9a-496c-b984-ec4a11ad17cc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_SeniorNotesDue2029Member_c6147453-7a90-4265-8af7-b0e824243ff0" xlink:href="mgm-20250630.xsd#mgm_SeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:to="loc_mgm_SeniorNotesDue2029Member_c6147453-7a90-4265-8af7-b0e824243ff0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaSeniorNotesDue2031Member_48081b29-e24a-4887-a5fb-e1bd612b0e6c" xlink:href="mgm-20250630.xsd#mgm_MGMChinaSeniorNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:to="loc_mgm_MGMChinaSeniorNotesDue2031Member_48081b29-e24a-4887-a5fb-e1bd612b0e6c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_SeniorNotesDue2032Member_c61d374e-6952-47b4-871d-75b9e8b7724c" xlink:href="mgm-20250630.xsd#mgm_SeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:to="loc_mgm_SeniorNotesDue2032Member_c61d374e-6952-47b4-871d-75b9e8b7724c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_DebenturesDue2036Member_7aae9c28-3650-40e4-b473-526c459880f3" xlink:href="mgm-20250630.xsd#mgm_DebenturesDue2036Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_690c9340-7bc8-4b64-a81a-d3ff2477069f" xlink:to="loc_mgm_DebenturesDue2036Member_7aae9c28-3650-40e4-b473-526c459880f3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4c4d0554-476c-439e-8cbe-97802cdd082c" 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_97b1f3f3-2298-442f-8b5a-0c9e3cff734c" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4c4d0554-476c-439e-8cbe-97802cdd082c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_2b077065-5220-457b-bb32-830147385b76" 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_97b1f3f3-2298-442f-8b5a-0c9e3cff734c" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_2b077065-5220-457b-bb32-830147385b76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_aa8a0e7c-34d1-40f4-a63f-1ec49a733756" 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_97b1f3f3-2298-442f-8b5a-0c9e3cff734c" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_aa8a0e7c-34d1-40f4-a63f-1ec49a733756" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotes_d89ea480-49c7-4247-aaa7-9eabfa815a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_97b1f3f3-2298-442f-8b5a-0c9e3cff734c" xlink:to="loc_us-gaap_SeniorNotes_d89ea480-49c7-4247-aaa7-9eabfa815a2a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_f4e17114-5ea6-4ff4-b4e0-0bf2c7961402" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_97b1f3f3-2298-442f-8b5a-0c9e3cff734c" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_f4e17114-5ea6-4ff4-b4e0-0bf2c7961402" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_dfe02f5c-fa0c-4f3a-8a8f-202bcd42bf09" 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_97b1f3f3-2298-442f-8b5a-0c9e3cff734c" xlink:to="loc_us-gaap_LongTermDebt_dfe02f5c-fa0c-4f3a-8a8f-202bcd42bf09" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/LONGTERMDEBTAdditionalInformationDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#LONGTERMDEBTAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/LONGTERMDEBTAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0bf8a105-7f27-4fa5-82bb-2615bd935ed5" 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_42a1fc19-9175-4221-8389-eb5571aa7235" 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_0bf8a105-7f27-4fa5-82bb-2615bd935ed5" xlink:to="loc_us-gaap_DebtInstrumentTable_42a1fc19-9175-4221-8389-eb5571aa7235" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_322fb225-245d-4a12-ae78-ac8f71773070" 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_42a1fc19-9175-4221-8389-eb5571aa7235" xlink:to="loc_us-gaap_CreditFacilityAxis_322fb225-245d-4a12-ae78-ac8f71773070" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_322fb225-245d-4a12-ae78-ac8f71773070_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_322fb225-245d-4a12-ae78-ac8f71773070" xlink:to="loc_us-gaap_CreditFacilityDomain_322fb225-245d-4a12-ae78-ac8f71773070_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_4d2cf56f-fa9d-40b6-9e20-23758e3d05f8" 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_322fb225-245d-4a12-ae78-ac8f71773070" xlink:to="loc_us-gaap_CreditFacilityDomain_4d2cf56f-fa9d-40b6-9e20-23758e3d05f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_5cb36622-57e2-49c5-b48b-090c85310ff3" 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_4d2cf56f-fa9d-40b6-9e20-23758e3d05f8" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_5cb36622-57e2-49c5-b48b-090c85310ff3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_91fd2a5a-0529-44ef-bd18-db58b6e164c0" 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_42a1fc19-9175-4221-8389-eb5571aa7235" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_91fd2a5a-0529-44ef-bd18-db58b6e164c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_91fd2a5a-0529-44ef-bd18-db58b6e164c0_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_91fd2a5a-0529-44ef-bd18-db58b6e164c0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_91fd2a5a-0529-44ef-bd18-db58b6e164c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_3d992b5f-f62a-466c-9382-bb4d08ffdf90" 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_91fd2a5a-0529-44ef-bd18-db58b6e164c0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_3d992b5f-f62a-466c-9382-bb4d08ffdf90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_1ca20c02-a64e-472c-b786-3a79f8695d07" 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_3d992b5f-f62a-466c-9382-bb4d08ffdf90" xlink:to="loc_us-gaap_LineOfCreditMember_1ca20c02-a64e-472c-b786-3a79f8695d07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_5cef2812-cf6c-411f-861c-9cafd65da028" 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_3d992b5f-f62a-466c-9382-bb4d08ffdf90" xlink:to="loc_us-gaap_SeniorNotesMember_5cef2812-cf6c-411f-861c-9cafd65da028" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_d02ffd5b-9600-41a9-af36-2ec14b6f2f9a" 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_42a1fc19-9175-4221-8389-eb5571aa7235" xlink:to="loc_us-gaap_DebtInstrumentAxis_d02ffd5b-9600-41a9-af36-2ec14b6f2f9a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d02ffd5b-9600-41a9-af36-2ec14b6f2f9a_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_d02ffd5b-9600-41a9-af36-2ec14b6f2f9a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d02ffd5b-9600-41a9-af36-2ec14b6f2f9a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0f75c64e-69df-4ac5-ad35-60555e898565" 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_d02ffd5b-9600-41a9-af36-2ec14b6f2f9a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_0f75c64e-69df-4ac5-ad35-60555e898565" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_SeniorSecuredCreditFacilityMember_7f2d8a90-2eba-4439-84dc-5d45b8abeb6f" xlink:href="mgm-20250630.xsd#mgm_SeniorSecuredCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0f75c64e-69df-4ac5-ad35-60555e898565" xlink:to="loc_mgm_SeniorSecuredCreditFacilityMember_7f2d8a90-2eba-4439-84dc-5d45b8abeb6f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaRevolvingCreditFacilityMember_94bba91e-ed07-4501-8256-7fa6a57a8b0c" xlink:href="mgm-20250630.xsd#mgm_MGMChinaRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0f75c64e-69df-4ac5-ad35-60555e898565" xlink:to="loc_mgm_MGMChinaRevolvingCreditFacilityMember_94bba91e-ed07-4501-8256-7fa6a57a8b0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_SeniorNotesDue2032Member_bba777b7-cc92-407b-ad03-d6f3df9e5a0d" xlink:href="mgm-20250630.xsd#mgm_SeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0f75c64e-69df-4ac5-ad35-60555e898565" xlink:to="loc_mgm_SeniorNotesDue2032Member_bba777b7-cc92-407b-ad03-d6f3df9e5a0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_SeniorNotes6.75Due2025Member_3ec5c4a1-b9ae-4f29-957a-0dc8e4889236" xlink:href="mgm-20250630.xsd#mgm_SeniorNotes6.75Due2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0f75c64e-69df-4ac5-ad35-60555e898565" xlink:to="loc_mgm_SeniorNotes6.75Due2025Member_3ec5c4a1-b9ae-4f29-957a-0dc8e4889236" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaSeniorNotesDue2025Member_dd533ae6-cd4b-4e7f-9e2e-575b532e55a6" xlink:href="mgm-20250630.xsd#mgm_MGMChinaSeniorNotesDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0f75c64e-69df-4ac5-ad35-60555e898565" xlink:to="loc_mgm_MGMChinaSeniorNotesDue2025Member_dd533ae6-cd4b-4e7f-9e2e-575b532e55a6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaSeniorNotesDue2031Member_8c1918be-b6ce-4515-89ea-859d27d69324" xlink:href="mgm-20250630.xsd#mgm_MGMChinaSeniorNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0f75c64e-69df-4ac5-ad35-60555e898565" xlink:to="loc_mgm_MGMChinaSeniorNotesDue2031Member_8c1918be-b6ce-4515-89ea-859d27d69324" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaSeniorNotesDue2024Member_dd76732c-80fe-4104-a738-e171756f4051" xlink:href="mgm-20250630.xsd#mgm_MGMChinaSeniorNotesDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0f75c64e-69df-4ac5-ad35-60555e898565" xlink:to="loc_mgm_MGMChinaSeniorNotesDue2024Member_dd76732c-80fe-4104-a738-e171756f4051" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c4f2cd32-eefd-4961-b130-9c8f4843c559" 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_DebtInstrumentTable_42a1fc19-9175-4221-8389-eb5571aa7235" xlink:to="loc_srt_RangeAxis_c4f2cd32-eefd-4961-b130-9c8f4843c559" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c4f2cd32-eefd-4961-b130-9c8f4843c559_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_c4f2cd32-eefd-4961-b130-9c8f4843c559" xlink:to="loc_srt_RangeMember_c4f2cd32-eefd-4961-b130-9c8f4843c559_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_aa4c7815-65b9-42c2-9e3e-4886242b412a" 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_c4f2cd32-eefd-4961-b130-9c8f4843c559" xlink:to="loc_srt_RangeMember_aa4c7815-65b9-42c2-9e3e-4886242b412a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_64514695-cf47-40ce-ad33-ddacd65cf012" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_aa4c7815-65b9-42c2-9e3e-4886242b412a" xlink:to="loc_srt_MinimumMember_64514695-cf47-40ce-ad33-ddacd65cf012" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ee31ff87-958d-4c13-927e-3879a1a2a424" 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_aa4c7815-65b9-42c2-9e3e-4886242b412a" xlink:to="loc_srt_MaximumMember_ee31ff87-958d-4c13-927e-3879a1a2a424" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_595ebd7b-453a-49a0-b65e-85f2a4a217ac" 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_0bf8a105-7f27-4fa5-82bb-2615bd935ed5" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_595ebd7b-453a-49a0-b65e-85f2a4a217ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_d220480e-487b-40f5-a100-05aac892a958" 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_0bf8a105-7f27-4fa5-82bb-2615bd935ed5" xlink:to="loc_us-gaap_LineOfCredit_d220480e-487b-40f5-a100-05aac892a958" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a49519b8-2fd5-4e50-883b-208ef056b1f8" 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_0bf8a105-7f27-4fa5-82bb-2615bd935ed5" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a49519b8-2fd5-4e50-883b-208ef056b1f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_9d8de3bd-6419-4960-86ee-fc08491ecfb7" 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_0bf8a105-7f27-4fa5-82bb-2615bd935ed5" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_9d8de3bd-6419-4960-86ee-fc08491ecfb7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_e0b9087c-3e04-4fef-86a6-572147567e30" 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_0bf8a105-7f27-4fa5-82bb-2615bd935ed5" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_e0b9087c-3e04-4fef-86a6-572147567e30" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0cebd285-197f-4fa8-996c-8af778b8ed8c" 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_0bf8a105-7f27-4fa5-82bb-2615bd935ed5" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0cebd285-197f-4fa8-996c-8af778b8ed8c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_3016feaf-3447-487f-b5d5-0b62eecf5964" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bf8a105-7f27-4fa5-82bb-2615bd935ed5" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_3016feaf-3447-487f-b5d5-0b62eecf5964" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_a99e1d62-92ae-4b0a-b026-5fcb6c217436" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0bf8a105-7f27-4fa5-82bb-2615bd935ed5" xlink:to="loc_us-gaap_LongTermDebtFairValue_a99e1d62-92ae-4b0a-b026-5fcb6c217436" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/LEASESScheduleofComponentsofLeaseCostsDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#LEASESScheduleofComponentsofLeaseCostsDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/LEASESScheduleofComponentsofLeaseCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_4d8e6f86-2982-48cd-b26f-5df1ca86faef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_fc324dad-5fae-4675-b9e7-614ed449d8bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4d8e6f86-2982-48cd-b26f-5df1ca86faef" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_fc324dad-5fae-4675-b9e7-614ed449d8bf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_5d4f95f1-ccd1-406d-8731-a60102acadcf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_fc324dad-5fae-4675-b9e7-614ed449d8bf" xlink:to="loc_us-gaap_LeaseContractualTermAxis_5d4f95f1-ccd1-406d-8731-a60102acadcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_5d4f95f1-ccd1-406d-8731-a60102acadcf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_5d4f95f1-ccd1-406d-8731-a60102acadcf" xlink:to="loc_us-gaap_LeaseContractualTermDomain_5d4f95f1-ccd1-406d-8731-a60102acadcf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_f31b5d7e-1571-48b8-a21a-1af129c65461" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_5d4f95f1-ccd1-406d-8731-a60102acadcf" xlink:to="loc_us-gaap_LeaseContractualTermDomain_f31b5d7e-1571-48b8-a21a-1af129c65461" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_BellagioMember_248c7e8d-461e-4a5f-8790-399dbbd0da49" xlink:href="mgm-20250630.xsd#mgm_BellagioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_f31b5d7e-1571-48b8-a21a-1af129c65461" xlink:to="loc_mgm_BellagioMember_248c7e8d-461e-4a5f-8790-399dbbd0da49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_2f98d2a3-91fb-4355-b7fa-872de45ccd29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4d8e6f86-2982-48cd-b26f-5df1ca86faef" xlink:to="loc_us-gaap_OperatingLeaseCost_2f98d2a3-91fb-4355-b7fa-872de45ccd29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_FinanceLeaseInterestExpenseCredit_18439ca2-41a6-42d1-8788-0ba8b9edb5d0" xlink:href="mgm-20250630.xsd#mgm_FinanceLeaseInterestExpenseCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4d8e6f86-2982-48cd-b26f-5df1ca86faef" xlink:to="loc_mgm_FinanceLeaseInterestExpenseCredit_18439ca2-41a6-42d1-8788-0ba8b9edb5d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_7258f850-7895-4ad1-bd12-efc0bdb2a521" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAssetAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4d8e6f86-2982-48cd-b26f-5df1ca86faef" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_7258f850-7895-4ad1-bd12-efc0bdb2a521" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_FinanceLeaseCost_94454526-bde8-4e3a-8f7d-7837d86f0818" xlink:href="mgm-20250630.xsd#mgm_FinanceLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_4d8e6f86-2982-48cd-b26f-5df1ca86faef" xlink:to="loc_mgm_FinanceLeaseCost_94454526-bde8-4e3a-8f7d-7837d86f0818" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/LEASESScheduleofSupplementalBalanceSheetInformationRelatedtoLeasesDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#LEASESScheduleofSupplementalBalanceSheetInformationRelatedtoLeasesDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/LEASESScheduleofSupplementalBalanceSheetInformationRelatedtoLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_f76f2cda-55d0-4d18-afd7-b388a46b6b1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_42201ee3-3754-46d0-8fd4-c3a86000e7ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f76f2cda-55d0-4d18-afd7-b388a46b6b1d" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_42201ee3-3754-46d0-8fd4-c3a86000e7ff" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_05bd6eee-048e-45d4-b814-4922260be45f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_42201ee3-3754-46d0-8fd4-c3a86000e7ff" xlink:to="loc_us-gaap_LeaseContractualTermAxis_05bd6eee-048e-45d4-b814-4922260be45f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_05bd6eee-048e-45d4-b814-4922260be45f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_05bd6eee-048e-45d4-b814-4922260be45f" xlink:to="loc_us-gaap_LeaseContractualTermDomain_05bd6eee-048e-45d4-b814-4922260be45f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_a240b519-0d31-43b3-bea0-04864c309fb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_05bd6eee-048e-45d4-b814-4922260be45f" xlink:to="loc_us-gaap_LeaseContractualTermDomain_a240b519-0d31-43b3-bea0-04864c309fb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_BellagioMember_50977f75-dfc1-4117-ba20-c4b5ab66db8c" xlink:href="mgm-20250630.xsd#mgm_BellagioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_a240b519-0d31-43b3-bea0-04864c309fb3" xlink:to="loc_mgm_BellagioMember_50977f75-dfc1-4117-ba20-c4b5ab66db8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_7a0e85ff-f96f-409a-bd1d-9c794a581b6e" xlink:href="mgm-20250630.xsd#mgm_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f76f2cda-55d0-4d18-afd7-b388a46b6b1d" xlink:to="loc_mgm_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_7a0e85ff-f96f-409a-bd1d-9c794a581b6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_8a86a3f5-4dcc-45ec-8c63-8286c920b5cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_7a0e85ff-f96f-409a-bd1d-9c794a581b6e" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_8a86a3f5-4dcc-45ec-8c63-8286c920b5cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_01d2fbe9-3d5f-4ca9-b4f3-4ea8caf62e31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_7a0e85ff-f96f-409a-bd1d-9c794a581b6e" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_01d2fbe9-3d5f-4ca9-b4f3-4ea8caf62e31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_d7d78c9d-899d-47fe-9264-dda26435daf7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_7a0e85ff-f96f-409a-bd1d-9c794a581b6e" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_d7d78c9d-899d-47fe-9264-dda26435daf7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_a0030d68-23f9-4330-9bf7-18458de82779" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_7a0e85ff-f96f-409a-bd1d-9c794a581b6e" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_a0030d68-23f9-4330-9bf7-18458de82779" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_7f48016d-5c94-45e3-831e-a0baa928d634" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_OperatingLeaseAssetsAndLiabilitiesLesseeAbstract_7a0e85ff-f96f-409a-bd1d-9c794a581b6e" xlink:to="loc_us-gaap_OperatingLeaseLiability_7f48016d-5c94-45e3-831e-a0baa928d634" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_c4fdef9e-b3ac-46f5-b3bd-ae18611e13fb" xlink:href="mgm-20250630.xsd#mgm_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f76f2cda-55d0-4d18-afd7-b388a46b6b1d" xlink:to="loc_mgm_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_c4fdef9e-b3ac-46f5-b3bd-ae18611e13fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_4aa3cfb6-fad1-4c73-abc2-c9946cacd3df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_c4fdef9e-b3ac-46f5-b3bd-ae18611e13fb" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_4aa3cfb6-fad1-4c73-abc2-c9946cacd3df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_e5bb62ed-b177-47dd-b270-e20cdca68af1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_c4fdef9e-b3ac-46f5-b3bd-ae18611e13fb" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_e5bb62ed-b177-47dd-b270-e20cdca68af1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_271700bd-07de-4125-a9d5-cc9f96b2d45d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_c4fdef9e-b3ac-46f5-b3bd-ae18611e13fb" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_271700bd-07de-4125-a9d5-cc9f96b2d45d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_81d3fc9f-2e21-4f00-8dda-844734844d16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_c4fdef9e-b3ac-46f5-b3bd-ae18611e13fb" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_81d3fc9f-2e21-4f00-8dda-844734844d16" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_cebe8b63-6a21-46a7-ad5a-6d969f482a75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_c4fdef9e-b3ac-46f5-b3bd-ae18611e13fb" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_cebe8b63-6a21-46a7-ad5a-6d969f482a75" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_7fe9938c-feb1-474d-b0d0-9f45fa03b03e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_c4fdef9e-b3ac-46f5-b3bd-ae18611e13fb" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_7fe9938c-feb1-474d-b0d0-9f45fa03b03e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_e56580a7-59e9-4ec2-94c2-42811e2d66f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_FinanceLeaseAssetsAndLiabilitiesLesseeAbstract_c4fdef9e-b3ac-46f5-b3bd-ae18611e13fb" xlink:to="loc_us-gaap_FinanceLeaseLiability_e56580a7-59e9-4ec2-94c2-42811e2d66f7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_WeightedAverageRemainingLeaseTermAbstract_c419d567-374a-4482-ac4b-a838e93a39da" xlink:href="mgm-20250630.xsd#mgm_WeightedAverageRemainingLeaseTermAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f76f2cda-55d0-4d18-afd7-b388a46b6b1d" xlink:to="loc_mgm_WeightedAverageRemainingLeaseTermAbstract_c419d567-374a-4482-ac4b-a838e93a39da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_2ca36635-898c-4f8a-af5a-5993b0085896" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_WeightedAverageRemainingLeaseTermAbstract_c419d567-374a-4482-ac4b-a838e93a39da" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_2ca36635-898c-4f8a-af5a-5993b0085896" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_25eb1fd3-25b3-4146-b35a-bb0a3a91276d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_WeightedAverageRemainingLeaseTermAbstract_c419d567-374a-4482-ac4b-a838e93a39da" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_25eb1fd3-25b3-4146-b35a-bb0a3a91276d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_LeasesWeightedAverageDiscountRateAbstract_f6cf3c37-05da-41e5-9062-20ad21ed9a9c" xlink:href="mgm-20250630.xsd#mgm_LeasesWeightedAverageDiscountRateAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f76f2cda-55d0-4d18-afd7-b388a46b6b1d" xlink:to="loc_mgm_LeasesWeightedAverageDiscountRateAbstract_f6cf3c37-05da-41e5-9062-20ad21ed9a9c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_78a674d7-728d-4c64-904e-88ff5f2d4dea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_LeasesWeightedAverageDiscountRateAbstract_f6cf3c37-05da-41e5-9062-20ad21ed9a9c" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_78a674d7-728d-4c64-904e-88ff5f2d4dea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_3294c9a9-a59c-4359-80b1-5dadec8db152" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_LeasesWeightedAverageDiscountRateAbstract_f6cf3c37-05da-41e5-9062-20ad21ed9a9c" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_3294c9a9-a59c-4359-80b1-5dadec8db152" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/COMMITMENTSANDCONTINGENCIESDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#COMMITMENTSANDCONTINGENCIESDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/COMMITMENTSANDCONTINGENCIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" 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_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" 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_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_us-gaap_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_427d8ea8-c648-441d-8794-d4963a7a4304" 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_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:to="loc_dei_LegalEntityAxis_427d8ea8-c648-441d-8794-d4963a7a4304" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_427d8ea8-c648-441d-8794-d4963a7a4304_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_427d8ea8-c648-441d-8794-d4963a7a4304" xlink:to="loc_dei_EntityDomain_427d8ea8-c648-441d-8794-d4963a7a4304_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_7f8b8340-5f34-4e10-80c2-219996398582" 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_427d8ea8-c648-441d-8794-d4963a7a4304" xlink:to="loc_dei_EntityDomain_7f8b8340-5f34-4e10-80c2-219996398582" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_InsuranceCarriersMember_c443bcb1-29cf-48f3-aad8-79072cf92a03" xlink:href="mgm-20250630.xsd#mgm_InsuranceCarriersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_7f8b8340-5f34-4e10-80c2-219996398582" xlink:to="loc_mgm_InsuranceCarriersMember_c443bcb1-29cf-48f3-aad8-79072cf92a03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_bfea72b7-eaee-4336-aaeb-330fe6bf8a83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_bfea72b7-eaee-4336-aaeb-330fe6bf8a83" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_bfea72b7-eaee-4336-aaeb-330fe6bf8a83_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_bfea72b7-eaee-4336-aaeb-330fe6bf8a83" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_bfea72b7-eaee-4336-aaeb-330fe6bf8a83_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f0887acb-deb1-4319-a7d7-b46fe22f214b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_bfea72b7-eaee-4336-aaeb-330fe6bf8a83" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f0887acb-deb1-4319-a7d7-b46fe22f214b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMGrandParadiseSAMember_c8bef365-4754-4b69-9b5d-b09828ab7e56" xlink:href="mgm-20250630.xsd#mgm_MGMGrandParadiseSAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f0887acb-deb1-4319-a7d7-b46fe22f214b" xlink:to="loc_mgm_MGMGrandParadiseSAMember_c8bef365-4754-4b69-9b5d-b09828ab7e56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfArrangementAxis_637cb7d9-54a6-4ce3-8cd9-fe354d6a7e9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfArrangementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:to="loc_us-gaap_TypeOfArrangementAxis_637cb7d9-54a6-4ce3-8cd9-fe354d6a7e9b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_637cb7d9-54a6-4ce3-8cd9-fe354d6a7e9b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TypeOfArrangementAxis_637cb7d9-54a6-4ce3-8cd9-fe354d6a7e9b" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_637cb7d9-54a6-4ce3-8cd9-fe354d6a7e9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_88f56a7d-0114-43f2-94c0-707a6bba314a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TypeOfArrangementAxis_637cb7d9-54a6-4ce3-8cd9-fe354d6a7e9b" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_88f56a7d-0114-43f2-94c0-707a6bba314a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_January2023ConcessionsMember_cfb641bc-0d8c-484c-bc73-08d096543306" xlink:href="mgm-20250630.xsd#mgm_January2023ConcessionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_88f56a7d-0114-43f2-94c0-707a6bba314a" xlink:to="loc_mgm_January2023ConcessionsMember_cfb641bc-0d8c-484c-bc73-08d096543306" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_GamingConcessionsMember_86113dbd-0b92-4494-af67-c4a7e775d561" xlink:href="mgm-20250630.xsd#mgm_GamingConcessionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_88f56a7d-0114-43f2-94c0-707a6bba314a" xlink:to="loc_mgm_GamingConcessionsMember_86113dbd-0b92-4494-af67-c4a7e775d561" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_03ecee59-9476-48ce-a0a7-8aaef17ece6d" 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_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_03ecee59-9476-48ce-a0a7-8aaef17ece6d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_03ecee59-9476-48ce-a0a7-8aaef17ece6d_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_03ecee59-9476-48ce-a0a7-8aaef17ece6d" xlink:to="loc_us-gaap_RelatedPartyDomain_03ecee59-9476-48ce-a0a7-8aaef17ece6d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_e546ee23-87a5-4af5-bf74-3ffe5d643a69" 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_03ecee59-9476-48ce-a0a7-8aaef17ece6d" xlink:to="loc_us-gaap_RelatedPartyDomain_e546ee23-87a5-4af5-bf74-3ffe5d643a69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_BlackstoneRealEstateIncomeTrustMember_2e525eb5-ce32-4e3a-b739-0d21573fab35" xlink:href="mgm-20250630.xsd#mgm_BlackstoneRealEstateIncomeTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_e546ee23-87a5-4af5-bf74-3ffe5d643a69" xlink:to="loc_mgm_BlackstoneRealEstateIncomeTrustMember_2e525eb5-ce32-4e3a-b739-0d21573fab35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_1c9db227-e577-4a74-9205-9b1178813120" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_1c9db227-e577-4a74-9205-9b1178813120" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_1c9db227-e577-4a74-9205-9b1178813120_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_1c9db227-e577-4a74-9205-9b1178813120" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_1c9db227-e577-4a74-9205-9b1178813120_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_0cc20a7b-7e5c-448f-a9db-9e67cfd3828e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_1c9db227-e577-4a74-9205-9b1178813120" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_0cc20a7b-7e5c-448f-a9db-9e67cfd3828e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceGuaranteeMember_448f91ef-53da-4147-9694-a50588a7dfbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_0cc20a7b-7e5c-448f-a9db-9e67cfd3828e" xlink:to="loc_us-gaap_PerformanceGuaranteeMember_448f91ef-53da-4147-9694-a50588a7dfbb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_23c08d20-3027-42d4-8fc6-f6ddfd1af244" 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_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_23c08d20-3027-42d4-8fc6-f6ddfd1af244" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_23c08d20-3027-42d4-8fc6-f6ddfd1af244_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_23c08d20-3027-42d4-8fc6-f6ddfd1af244" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_23c08d20-3027-42d4-8fc6-f6ddfd1af244_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_8f6ac2fe-b080-4a80-8ac3-48a965ac68d5" 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_23c08d20-3027-42d4-8fc6-f6ddfd1af244" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_8f6ac2fe-b080-4a80-8ac3-48a965ac68d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMOsakaCorporationMember_2798ef04-4314-4993-87b4-75daa2095b99" xlink:href="mgm-20250630.xsd#mgm_MGMOsakaCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_8f6ac2fe-b080-4a80-8ac3-48a965ac68d5" xlink:to="loc_mgm_MGMOsakaCorporationMember_2798ef04-4314-4993-87b4-75daa2095b99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_1aa5de73-4bb2-4bae-b56f-0658bcb52dd6" 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_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:to="loc_srt_StatementGeographicalAxis_1aa5de73-4bb2-4bae-b56f-0658bcb52dd6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_1aa5de73-4bb2-4bae-b56f-0658bcb52dd6_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_1aa5de73-4bb2-4bae-b56f-0658bcb52dd6" xlink:to="loc_srt_SegmentGeographicalDomain_1aa5de73-4bb2-4bae-b56f-0658bcb52dd6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_23d1649f-dc46-4f1f-80ec-2a0aaca40a05" 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_1aa5de73-4bb2-4bae-b56f-0658bcb52dd6" xlink:to="loc_srt_SegmentGeographicalDomain_23d1649f-dc46-4f1f-80ec-2a0aaca40a05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_JP_0be2dc43-0397-4b42-b95c-d3de84c83758" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_JP"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_23d1649f-dc46-4f1f-80ec-2a0aaca40a05" xlink:to="loc_country_JP_0be2dc43-0397-4b42-b95c-d3de84c83758" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_e83f2a2e-c071-4de8-9e00-958e25f2326d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:to="loc_us-gaap_PledgedStatusAxis_e83f2a2e-c071-4de8-9e00-958e25f2326d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_e83f2a2e-c071-4de8-9e00-958e25f2326d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_e83f2a2e-c071-4de8-9e00-958e25f2326d" xlink:to="loc_us-gaap_PledgedStatusDomain_e83f2a2e-c071-4de8-9e00-958e25f2326d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_4fddf7ab-53a6-484b-8ba9-868b8b578019" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_e83f2a2e-c071-4de8-9e00-958e25f2326d" xlink:to="loc_us-gaap_PledgedStatusDomain_4fddf7ab-53a6-484b-8ba9-868b8b578019" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_5fe145d4-7b0c-4950-bff5-951bc1204444" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_4fddf7ab-53a6-484b-8ba9-868b8b578019" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_5fe145d4-7b0c-4950-bff5-951bc1204444" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_50bec630-3782-4caf-905a-55230ae69ecf" 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_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:to="loc_us-gaap_CreditFacilityAxis_50bec630-3782-4caf-905a-55230ae69ecf" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_50bec630-3782-4caf-905a-55230ae69ecf_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_50bec630-3782-4caf-905a-55230ae69ecf" xlink:to="loc_us-gaap_CreditFacilityDomain_50bec630-3782-4caf-905a-55230ae69ecf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1335b0c6-a24c-4f53-8a91-c7ad66bfd5aa" 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_50bec630-3782-4caf-905a-55230ae69ecf" xlink:to="loc_us-gaap_CreditFacilityDomain_1335b0c6-a24c-4f53-8a91-c7ad66bfd5aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_227b3f5b-66ec-48f3-b1c5-d6ca22c97317" 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_1335b0c6-a24c-4f53-8a91-c7ad66bfd5aa" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_227b3f5b-66ec-48f3-b1c5-d6ca22c97317" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_5cbdcd34-4f6d-4847-8dab-4fc11e222c70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_fef9c598-1cfc-4a58-9f1d-dea009a4f7d2" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_5cbdcd34-4f6d-4847-8dab-4fc11e222c70" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_5cbdcd34-4f6d-4847-8dab-4fc11e222c70_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_5cbdcd34-4f6d-4847-8dab-4fc11e222c70" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_5cbdcd34-4f6d-4847-8dab-4fc11e222c70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_073106b9-2016-430a-b774-3c683a3447b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_5cbdcd34-4f6d-4847-8dab-4fc11e222c70" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_073106b9-2016-430a-b774-3c683a3447b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_SeniorCreditFacilityMember_5d04cb20-0559-4fd3-b577-8aafa8e2e258" xlink:href="mgm-20250630.xsd#mgm_SeniorCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_073106b9-2016-430a-b774-3c683a3447b7" xlink:to="loc_mgm_SeniorCreditFacilityMember_5d04cb20-0559-4fd3-b577-8aafa8e2e258" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForLegalSettlements_9127bc75-278b-4a99-9062-c2c7a2f6d881" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_us-gaap_PaymentsForLegalSettlements_9127bc75-278b-4a99-9062-c2c7a2f6d881" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_d9a64cb4-1e68-401b-9ed9-871dffec7604" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_d9a64cb4-1e68-401b-9ed9-871dffec7604" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_GuarantorObligationsMaximumExposureExpirationAfterConcessionTerm_6e8d49f7-9ec9-41fc-a508-5f60bef19c54" xlink:href="mgm-20250630.xsd#mgm_GuarantorObligationsMaximumExposureExpirationAfterConcessionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_mgm_GuarantorObligationsMaximumExposureExpirationAfterConcessionTerm_6e8d49f7-9ec9-41fc-a508-5f60bef19c54" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_81ef6193-c5c5-4078-b9c2-fa833fe65084" 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_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_81ef6193-c5c5-4078-b9c2-fa833fe65084" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_acfb9d9f-1f0d-44bf-92de-72932706ace8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_us-gaap_EquityMethodInvestments_acfb9d9f-1f0d-44bf-92de-72932706ace8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_PurchaseCommitmentAmount_8c39cc74-0c22-4d5c-a1c2-d43678e3e8a0" xlink:href="mgm-20250630.xsd#mgm_PurchaseCommitmentAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_mgm_PurchaseCommitmentAmount_8c39cc74-0c22-4d5c-a1c2-d43678e3e8a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_a3ebd4d6-4f4b-46a6-a89b-440095ae6794" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_a3ebd4d6-4f4b-46a6-a89b-440095ae6794" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_54aa8279-7783-4c8a-9662-23d7b27dcc47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_54aa8279-7783-4c8a-9662-23d7b27dcc47" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_2c9747ce-7be7-443d-8536-400a682d60c5" 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_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_2c9747ce-7be7-443d-8536-400a682d60c5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_ba8b4bb9-9f19-4026-93bc-cd520bc50765" 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_LossContingenciesLineItems_93df9865-3cce-4ac7-af87-5af3b35c5127" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_ba8b4bb9-9f19-4026-93bc-cd520bc50765" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/STOCKHOLDERSEQUITYDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#STOCKHOLDERSEQUITYDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/STOCKHOLDERSEQUITYDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_mgm_ScheduleOfStockholdersEquityNoteLineItems_5d446488-d53b-47a4-9268-87ca117d3a9a" xlink:href="mgm-20250630.xsd#mgm_ScheduleOfStockholdersEquityNoteLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_ScheduleOfStockholdersEquityNoteTable_d87ccf50-77ef-41f6-93c7-44933c61aecb" xlink:href="mgm-20250630.xsd#mgm_ScheduleOfStockholdersEquityNoteTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mgm_ScheduleOfStockholdersEquityNoteLineItems_5d446488-d53b-47a4-9268-87ca117d3a9a" xlink:to="loc_mgm_ScheduleOfStockholdersEquityNoteTable_d87ccf50-77ef-41f6-93c7-44933c61aecb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_46a24a75-a7d8-4ca5-81dc-5ae1fc0771fd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mgm_ScheduleOfStockholdersEquityNoteTable_d87ccf50-77ef-41f6-93c7-44933c61aecb" xlink:to="loc_srt_ShareRepurchaseProgramAxis_46a24a75-a7d8-4ca5-81dc-5ae1fc0771fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_46a24a75-a7d8-4ca5-81dc-5ae1fc0771fd_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_46a24a75-a7d8-4ca5-81dc-5ae1fc0771fd" xlink:to="loc_srt_ShareRepurchaseProgramDomain_46a24a75-a7d8-4ca5-81dc-5ae1fc0771fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_6c8470aa-cfea-49d8-a71f-2d8d876dfcef" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_46a24a75-a7d8-4ca5-81dc-5ae1fc0771fd" xlink:to="loc_srt_ShareRepurchaseProgramDomain_6c8470aa-cfea-49d8-a71f-2d8d876dfcef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_ShareRepurchaseProgramMember_f98b15d9-60cf-4f37-9515-578e741435dd" xlink:href="mgm-20250630.xsd#mgm_ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_6c8470aa-cfea-49d8-a71f-2d8d876dfcef" xlink:to="loc_mgm_ShareRepurchaseProgramMember_f98b15d9-60cf-4f37-9515-578e741435dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_ShareRepurchaseProgramFebruary2023Member_9fa0dde0-bcb4-4aad-aac4-78084842ed67" xlink:href="mgm-20250630.xsd#mgm_ShareRepurchaseProgramFebruary2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_ShareRepurchaseProgramMember_f98b15d9-60cf-4f37-9515-578e741435dd" xlink:to="loc_mgm_ShareRepurchaseProgramFebruary2023Member_9fa0dde0-bcb4-4aad-aac4-78084842ed67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_ShareRepurchaseProgramNovember2023Member_4f9d5de1-ede3-45e9-9d89-d430774ed44e" xlink:href="mgm-20250630.xsd#mgm_ShareRepurchaseProgramNovember2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_ShareRepurchaseProgramMember_f98b15d9-60cf-4f37-9515-578e741435dd" xlink:to="loc_mgm_ShareRepurchaseProgramNovember2023Member_4f9d5de1-ede3-45e9-9d89-d430774ed44e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_ShareRepurchaseProgramApril2025Member_58b54b7b-57e9-45a0-93f3-fc2b5dca1dd0" xlink:href="mgm-20250630.xsd#mgm_ShareRepurchaseProgramApril2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_ShareRepurchaseProgramMember_f98b15d9-60cf-4f37-9515-578e741435dd" xlink:to="loc_mgm_ShareRepurchaseProgramApril2025Member_58b54b7b-57e9-45a0-93f3-fc2b5dca1dd0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_16290aa3-5c53-404f-a59a-b76e8a13e05e" 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_mgm_ScheduleOfStockholdersEquityNoteTable_d87ccf50-77ef-41f6-93c7-44933c61aecb" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_16290aa3-5c53-404f-a59a-b76e8a13e05e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_16290aa3-5c53-404f-a59a-b76e8a13e05e_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_16290aa3-5c53-404f-a59a-b76e8a13e05e" xlink:to="loc_us-gaap_EquityComponentDomain_16290aa3-5c53-404f-a59a-b76e8a13e05e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_710fc2c3-58f3-4b44-8b56-b3537ad15fb8" 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_16290aa3-5c53-404f-a59a-b76e8a13e05e" xlink:to="loc_us-gaap_EquityComponentDomain_710fc2c3-58f3-4b44-8b56-b3537ad15fb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_55af9244-c6ad-4ae7-bf7f-cb739e858464" 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_EquityComponentDomain_710fc2c3-58f3-4b44-8b56-b3537ad15fb8" xlink:to="loc_us-gaap_CommonStockMember_55af9244-c6ad-4ae7-bf7f-cb739e858464" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_478e69d4-faf0-494f-bc3d-e5cce206a664" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_ScheduleOfStockholdersEquityNoteLineItems_5d446488-d53b-47a4-9268-87ca117d3a9a" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_478e69d4-faf0-494f-bc3d-e5cce206a664" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_19995982-9c6f-46aa-a069-c0a835fae245" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_ScheduleOfStockholdersEquityNoteLineItems_5d446488-d53b-47a4-9268-87ca117d3a9a" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_19995982-9c6f-46aa-a069-c0a835fae245" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_b5ccfc13-bddd-499c-81c9-99dc2ca92718" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_ScheduleOfStockholdersEquityNoteLineItems_5d446488-d53b-47a4-9268-87ca117d3a9a" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_b5ccfc13-bddd-499c-81c9-99dc2ca92718" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_0a5ad1f0-58a1-47cf-8a9f-674c6b7210fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_ScheduleOfStockholdersEquityNoteLineItems_5d446488-d53b-47a4-9268-87ca117d3a9a" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_0a5ad1f0-58a1-47cf-8a9f-674c6b7210fd" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.mgmresorts.com/role/SEGMENTINFORMATIONDetails" xlink:type="simple" xlink:href="mgm-20250630.xsd#SEGMENTINFORMATIONDetails"/>
  <link:definitionLink xlink:role="http://www.mgmresorts.com/role/SEGMENTINFORMATIONDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" 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_eee6af3c-5ded-4253-9074-eac3374ba3d6" 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_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_eee6af3c-5ded-4253-9074-eac3374ba3d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_e3b0819c-cb4a-4cfa-870a-5e34cb6abe7c" 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_ScheduleOfSegmentReportingInformationBySegmentTable_eee6af3c-5ded-4253-9074-eac3374ba3d6" xlink:to="loc_srt_ProductOrServiceAxis_e3b0819c-cb4a-4cfa-870a-5e34cb6abe7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e3b0819c-cb4a-4cfa-870a-5e34cb6abe7c_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_e3b0819c-cb4a-4cfa-870a-5e34cb6abe7c" xlink:to="loc_srt_ProductsAndServicesDomain_e3b0819c-cb4a-4cfa-870a-5e34cb6abe7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bb51683e-7750-4aee-99c5-f8dc42393666" 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_e3b0819c-cb4a-4cfa-870a-5e34cb6abe7c" xlink:to="loc_srt_ProductsAndServicesDomain_bb51683e-7750-4aee-99c5-f8dc42393666" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CasinoMember_fab40b97-34df-474f-b5fa-eaba8be3db99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CasinoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bb51683e-7750-4aee-99c5-f8dc42393666" xlink:to="loc_us-gaap_CasinoMember_fab40b97-34df-474f-b5fa-eaba8be3db99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyMember_6af5385f-a4cf-4473-9d05-35338733db34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OccupancyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bb51683e-7750-4aee-99c5-f8dc42393666" xlink:to="loc_us-gaap_OccupancyMember_6af5385f-a4cf-4473-9d05-35338733db34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FoodAndBeverageMember_7c39bdbc-2713-4f7d-8b62-ee050bcf85ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FoodAndBeverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bb51683e-7750-4aee-99c5-f8dc42393666" xlink:to="loc_us-gaap_FoodAndBeverageMember_7c39bdbc-2713-4f7d-8b62-ee050bcf85ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_EntertainmentRetailAndOtherMember_cabf861c-fddf-45a0-9fe5-df391b7e1554" xlink:href="mgm-20250630.xsd#mgm_EntertainmentRetailAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bb51683e-7750-4aee-99c5-f8dc42393666" xlink:to="loc_mgm_EntertainmentRetailAndOtherMember_cabf861c-fddf-45a0-9fe5-df391b7e1554" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_37c1708a-94fe-42d7-b40d-1379f603ed11" 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_eee6af3c-5ded-4253-9074-eac3374ba3d6" xlink:to="loc_srt_ConsolidationItemsAxis_37c1708a-94fe-42d7-b40d-1379f603ed11" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_37c1708a-94fe-42d7-b40d-1379f603ed11_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_37c1708a-94fe-42d7-b40d-1379f603ed11" xlink:to="loc_srt_ConsolidationItemsDomain_37c1708a-94fe-42d7-b40d-1379f603ed11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_cd0a373a-298f-42ee-b2b9-9a0e5cf2988e" 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_37c1708a-94fe-42d7-b40d-1379f603ed11" xlink:to="loc_srt_ConsolidationItemsDomain_cd0a373a-298f-42ee-b2b9-9a0e5cf2988e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_e0206173-f56c-43cb-86f6-861f6ad3fe57" 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_cd0a373a-298f-42ee-b2b9-9a0e5cf2988e" xlink:to="loc_us-gaap_OperatingSegmentsMember_e0206173-f56c-43cb-86f6-861f6ad3fe57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_CorporateAndReconcilingItemsMember_4915ba01-1411-47cd-99b8-9dd777dd9b2e" xlink:href="mgm-20250630.xsd#mgm_CorporateAndReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_cd0a373a-298f-42ee-b2b9-9a0e5cf2988e" xlink:to="loc_mgm_CorporateAndReconcilingItemsMember_4915ba01-1411-47cd-99b8-9dd777dd9b2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ac2b7691-5a5d-47a9-bdfb-d4cb87e6ee87" 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_eee6af3c-5ded-4253-9074-eac3374ba3d6" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ac2b7691-5a5d-47a9-bdfb-d4cb87e6ee87" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ac2b7691-5a5d-47a9-bdfb-d4cb87e6ee87_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_ac2b7691-5a5d-47a9-bdfb-d4cb87e6ee87" xlink:to="loc_us-gaap_SegmentDomain_ac2b7691-5a5d-47a9-bdfb-d4cb87e6ee87_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_c6127c26-0861-4849-a8e6-2be46eb4df38" 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_ac2b7691-5a5d-47a9-bdfb-d4cb87e6ee87" xlink:to="loc_us-gaap_SegmentDomain_c6127c26-0861-4849-a8e6-2be46eb4df38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_LasVegasStripResortsMember_d0b9c41a-2ca7-4a4e-ae10-d47cc7baf260" xlink:href="mgm-20250630.xsd#mgm_LasVegasStripResortsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c6127c26-0861-4849-a8e6-2be46eb4df38" xlink:to="loc_mgm_LasVegasStripResortsMember_d0b9c41a-2ca7-4a4e-ae10-d47cc7baf260" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_RegionalOperationsMember_7a9a3eba-6a59-463c-964a-8c7c9d6fe437" xlink:href="mgm-20250630.xsd#mgm_RegionalOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c6127c26-0861-4849-a8e6-2be46eb4df38" xlink:to="loc_mgm_RegionalOperationsMember_7a9a3eba-6a59-463c-964a-8c7c9d6fe437" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMChinaMember_35257231-5b5b-409c-8fa9-669ae930c943" xlink:href="mgm-20250630.xsd#mgm_MGMChinaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c6127c26-0861-4849-a8e6-2be46eb4df38" xlink:to="loc_mgm_MGMChinaMember_35257231-5b5b-409c-8fa9-669ae930c943" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_MGMDigitalMember_38aa0492-f0ef-4e5c-8bec-c78b541d7184" xlink:href="mgm-20250630.xsd#mgm_MGMDigitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c6127c26-0861-4849-a8e6-2be46eb4df38" xlink:to="loc_mgm_MGMDigitalMember_38aa0492-f0ef-4e5c-8bec-c78b541d7184" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_fe4bf8d5-1c68-45ff-95a4-a0ee1c962611" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerAbstract_fe4bf8d5-1c68-45ff-95a4-a0ee1c962611" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_c3e95231-279c-40db-a134-e4d565b1bf46" 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_RevenueFromContractWithCustomerAbstract_fe4bf8d5-1c68-45ff-95a4-a0ee1c962611" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_c3e95231-279c-40db-a134-e4d565b1bf46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_cb0e7602-d132-4100-928b-97c0d35a0ce8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_cb0e7602-d132-4100-928b-97c0d35a0ce8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_f9a2394a-3e1d-4b17-872f-6277b75ea24c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_cb0e7602-d132-4100-928b-97c0d35a0ce8" xlink:to="loc_us-gaap_LaborAndRelatedExpense_f9a2394a-3e1d-4b17-872f-6277b75ea24c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_2f87ce5b-b1c3-46e2-a9e9-a3aa09fe5b8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_cb0e7602-d132-4100-928b-97c0d35a0ce8" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_2f87ce5b-b1c3-46e2-a9e9-a3aa09fe5b8f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_GamingTax_81e98b98-5397-4608-9baa-a6123f3b4ec3" xlink:href="mgm-20250630.xsd#mgm_GamingTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_cb0e7602-d132-4100-928b-97c0d35a0ce8" xlink:to="loc_mgm_GamingTax_81e98b98-5397-4608-9baa-a6123f3b4ec3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_40cf680d-9277-4bc7-b23e-cd0c323207b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_cb0e7602-d132-4100-928b-97c0d35a0ce8" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_40cf680d-9277-4bc7-b23e-cd0c323207b1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingExpense_6e1dd32d-1f06-498e-a7e0-bbba468e724d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_cb0e7602-d132-4100-928b-97c0d35a0ce8" xlink:to="loc_us-gaap_MarketingExpense_6e1dd32d-1f06-498e-a7e0-bbba468e724d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_ebf66ecf-c4a4-45fb-ae51-c80fba520eb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_cb0e7602-d132-4100-928b-97c0d35a0ce8" xlink:to="loc_us-gaap_CostsAndExpenses_ebf66ecf-c4a4-45fb-ae51-c80fba520eb7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_AdjustedPropertyEBITDARAbstract_4785dfe8-4223-4f41-a9cd-0fea9e0effb0" xlink:href="mgm-20250630.xsd#mgm_AdjustedPropertyEBITDARAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_mgm_AdjustedPropertyEBITDARAbstract_4785dfe8-4223-4f41-a9cd-0fea9e0effb0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_AdjustedEarningsBeforeInterestTaxesDepreciationAmortizationAndRentExpense_858c995b-e552-4804-b9a8-a53bd59aafc9" xlink:href="mgm-20250630.xsd#mgm_AdjustedEarningsBeforeInterestTaxesDepreciationAmortizationAndRentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mgm_AdjustedPropertyEBITDARAbstract_4785dfe8-4223-4f41-a9cd-0fea9e0effb0" xlink:to="loc_mgm_AdjustedEarningsBeforeInterestTaxesDepreciationAmortizationAndRentExpense_858c995b-e552-4804-b9a8-a53bd59aafc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract_00c90d66-7b22-41ad-83c5-f0bfe13be5b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract_00c90d66-7b22-41ad-83c5-f0bfe13be5b0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_ddc4622e-8661-43c8-9475-bf664fba71d7" 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_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract_00c90d66-7b22-41ad-83c5-f0bfe13be5b0" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_ddc4622e-8661-43c8-9475-bf664fba71d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_PreopeningAndStartUpIncomeExpense_92753f3f-a9ff-4939-9ec8-61121ec82387" xlink:href="mgm-20250630.xsd#mgm_PreopeningAndStartUpIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract_00c90d66-7b22-41ad-83c5-f0bfe13be5b0" xlink:to="loc_mgm_PreopeningAndStartUpIncomeExpense_92753f3f-a9ff-4939-9ec8-61121ec82387" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_PropertyTransactionsNet_8b6a6db9-b829-4949-a5b9-fec5b348ee29" xlink:href="mgm-20250630.xsd#mgm_PropertyTransactionsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract_00c90d66-7b22-41ad-83c5-f0bfe13be5b0" xlink:to="loc_mgm_PropertyTransactionsNet_8b6a6db9-b829-4949-a5b9-fec5b348ee29" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_86a1c49a-2df9-4fce-a2d6-a6b8ac202498" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract_00c90d66-7b22-41ad-83c5-f0bfe13be5b0" xlink:to="loc_us-gaap_DepreciationAndAmortization_86a1c49a-2df9-4fce-a2d6-a6b8ac202498" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_TripleNetOperatingLeaseAndGroundLeaseRentExpense_9fee2b3c-81d1-4be7-8c7e-3778aeb82aa8" xlink:href="mgm-20250630.xsd#mgm_TripleNetOperatingLeaseAndGroundLeaseRentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract_00c90d66-7b22-41ad-83c5-f0bfe13be5b0" xlink:to="loc_mgm_TripleNetOperatingLeaseAndGroundLeaseRentExpense_9fee2b3c-81d1-4be7-8c7e-3778aeb82aa8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_IncomeLossFromUnconsolidatedAffiliates_44722d54-7cec-4df5-bef7-438f50fde34d" xlink:href="mgm-20250630.xsd#mgm_IncomeLossFromUnconsolidatedAffiliates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract_00c90d66-7b22-41ad-83c5-f0bfe13be5b0" xlink:to="loc_mgm_IncomeLossFromUnconsolidatedAffiliates_44722d54-7cec-4df5-bef7-438f50fde34d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_95a82187-ac5b-4db4-ad4b-ece92ac70316" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingOtherSignificantReconcilingItemConsolidatedAbstract_00c90d66-7b22-41ad-83c5-f0bfe13be5b0" xlink:to="loc_us-gaap_OperatingIncomeLoss_95a82187-ac5b-4db4-ad4b-ece92ac70316" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_5ffad2b4-5dec-44f3-80bb-2a25a42acc31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_5ffad2b4-5dec-44f3-80bb-2a25a42acc31" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_53586381-0d34-4310-a0de-759a0f71e787" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_5ffad2b4-5dec-44f3-80bb-2a25a42acc31" xlink:to="loc_us-gaap_InterestExpenseNonoperating_53586381-0d34-4310-a0de-759a0f71e787" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgm_NonOperatingExpenseIncomeFromUnconsolidatedAffiliates_739ef777-5ba4-4f84-a551-5419d6868d4e" xlink:href="mgm-20250630.xsd#mgm_NonOperatingExpenseIncomeFromUnconsolidatedAffiliates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_5ffad2b4-5dec-44f3-80bb-2a25a42acc31" xlink:to="loc_mgm_NonOperatingExpenseIncomeFromUnconsolidatedAffiliates_739ef777-5ba4-4f84-a551-5419d6868d4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_06012d64-e432-4aeb-8c45-7c0432f566e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_5ffad2b4-5dec-44f3-80bb-2a25a42acc31" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_06012d64-e432-4aeb-8c45-7c0432f566e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_57e0c1b6-3180-4e8b-bb7d-394e0658e86c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_5ffad2b4-5dec-44f3-80bb-2a25a42acc31" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_57e0c1b6-3180-4e8b-bb7d-394e0658e86c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4e4581c5-9d39-4c86-b234-fba548ad54fe" 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_us-gaap_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4e4581c5-9d39-4c86-b234-fba548ad54fe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_40a61209-2005-41bc-a2a9-ed23f8b4fda7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_40a61209-2005-41bc-a2a9-ed23f8b4fda7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_932b162d-f670-42e1-b8f0-93cba5844bf1" 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_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_ProfitLoss_932b162d-f670-42e1-b8f0-93cba5844bf1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_fd752be0-ef97-4f77-b120-39c2862edfba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_fd752be0-ef97-4f77-b120-39c2862edfba" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_dde832da-bfe7-43b4-9008-576918a7f8a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_NetIncomeLoss_dde832da-bfe7-43b4-9008-576918a7f8a9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_c72571c4-fd9c-4083-8013-1861c30e404e" 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_SegmentReportingInformationLineItems_d6d6f6ea-1788-438d-aa0e-d6d80be72e41" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_c72571c4-fd9c-4083-8013-1861c30e404e" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet" xlink:type="arc" order="101"/>
  </link:definitionLink>
</link:linkbase>
