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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 from the Cambridge Business English Dictionary © Cambridge University Press)
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