ultimatum

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ul·ti·ma·tum / ˌəltəˈmātəm; -ˈmät-/ • n. (pl. -ma·tums or -ma·ta / -ˈmātə; -ˈmätə/ ) a final demand or statement of terms, the rejection of which will result in retaliation or a breakdown in relations: the UN Security Council ultimatum demanding Iraq's withdrawal from Kuwait a “Marry me or else” ultimatum.