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English definition of “ultimatum”

ultimatum

noun [C]     /ˌʌltɪˈmeɪtəm/
a warning , usually the last and most threatening one in a series , in which someone is told that if they take a particular action , something unpleasant will happen to them: issue/deliver/give an ultimatum The chairman has issued an ultimatum: sort out the problems , or the expansion will not take place . Should I give him some kind of ultimatum to encourage him to retire ?
(Definition of ultimatum noun from the Cambridge Business English Dictionary © Cambridge University Press)
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