Definition of ultimatum in English:

ultimatum

Syllabification: ul·ti·ma·tum
Pronunciation: /ˌəltəˈmātəm, -ˈmät-
 
/

noun (plural ultimatums or ultimata /-ˈmātə, -ˈmätə/)

  • A final demand or statement of terms, the rejection of which will result in retaliation or a breakdown in relations: their employers issued an ultimatum demanding an immediate return to work a “Marry me or else” ultimatum
    More example sentences
    • In recent years he has repeatedly issued ultimatums demanding that area plants become more profitable.
    • This should be an ultimatum - accept new terms and conditions or think about an alternative career.
    • Instead, he issued an ultimatum to the people who are suffering under this occupation.
    Synonyms
    final offer, final demand, take-it-or-leave-it deal; threat

Origin

mid 18th century: from Latin, neuter past participle of ultimare 'come to an end'.

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