American English

Definition of ultimatum noun from the Oxford Advanced American Dictionary

 

ultimatum

 noun
noun
NAmE//ˌʌltəˈmeɪt̮əm//
 
(pl. ultimatums or ultimata)
 
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a final warning to a person or country that if they do not do what you ask, you will use force or take action against them to issue an ultimatum
See the Oxford Advanced Learner's Dictionary entry: ultimatum