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ultimatum

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ultimatum/ˌʌltəˈmeɪtəm/noun
pluralultimatumsorultimata/-tə//ˌʌltəˈmeɪtə/
ultimatum
/ˌʌltəˈmeɪtəm/
noun
pluralultimatumsorultimata/-tə//ˌʌltəˈmeɪtə/
Learner's definition of ULTIMATUM  
[count]
: a final threat : a promise that force or punishment will be used if someone does not do what is wanted
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