- a final communication by a party, esp a government, setting forth conditions on which it insists, as during negotiations on some topic
- any final or peremptory demand, offer, or proposal
WordReference Random House Learner's Dictionary of American English © 2026
ul•ti•ma•tum /ˌʌltəˈmeɪtəm, -ˈmɑ-/USA pronunciation
n. [countable], pl. -tums, -ta /-tə/USA pronunciation .
WordReference Random House Unabridged Dictionary of American English © 2026- a final demand issued by one side in a dispute, that if rejected will lead to the ending of talks and the use of force.
ul•ti•ma•tum
(ul′tə mā′təm, -mä′-),USA pronunciation n., pl. -tums, -ta (-tə).USA pronunciation
- a final, uncompromising demand or set of terms issued by a party to a dispute, the rejection of which may lead to a severance of relations or to the use of force.
- a final proposal or statement of conditions.
- Neo-Latin, noun, nominal use of neuter of Late Latin ultimātus. See ultimate
- 1725–35
Collins Concise English Dictionary © HarperCollins Publishers::
ultimatum /ˌʌltɪˈmeɪtəm/ n ( pl -tums, -ta /-tə/)
'ultimatum' also found in these entries (note: many are not synonyms or translations):