UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌʌltɪˈmeɪtəm/

US:USA pronuncation: IPAUSA pronuncation: IPA/ˌʌltəˈmeɪtəm, -ˈmɑ-/

US:USA pronunciation: respellingUSA pronunciation: respelling(ul′tə mātəm, -mä-)

Inflections of 'ultimatum' (nnoun: Refers to person, place, thing, quality, etc.):
nplplural noun: Noun always used in plural form--for example, "jeans," "scissors."
nplplural noun: Noun always used in plural form--for example, "jeans," "scissors."

WordReference Random House Learner's Dictionary of American English © 2020
ul•ti•ma•tum /ˌʌltəˈmeɪtəm, -ˈmɑ-/USA pronunciation   n.[countable]pl.  -tums, -ta /-tə/USA pronunciation  .
  1. 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.
See -ult-.
WordReference Random House Unabridged Dictionary of American English © 2020
ul•ti•ma•tum  (ul′tə mātəm, -mä-),USA pronunciation n., pl.  -tums, -ta (ul′tə mātəm, -mä-),USA pronunciation 
  1. 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.
  2. 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/)
  1. a final communication by a party, esp a government, setting forth conditions on which it insists, as during negotiations on some topic
  2. any final or peremptory demand, offer, or proposal
Etymology: 18th Century: from New Latin, neuter of ultimatus ultimate
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