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ultimatum

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noun [countable] American English pronunciation: ultimatum /ˌʌltɪˈmeɪtəm/ 
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singularultimatum
pluralultimatums
  1. a statement that orders someone to do something and threatens to punish or attack them if they do not
    issue an ultimatum:

    The management yesterday issued an ultimatum to the workforce.

    give someone an ultimatum:

    NATO gave the Serbs an ultimatum.

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