ultimatum

noun

ul·​ti·​ma·​tum ˌəl-tə-ˈmā-təm  -ˈmä- 

plural ultimatums or ultimata ˌəl-tə-ˈmā-tə 

-ˈmä-

: a final proposition, condition, or demand

especially : one whose rejection will end negotiations and cause a resort to force or other direct action

Synonyms

• claim
• demand
• dun
• importunity
• requisition

Examples of ultimatum in a Sentence

She was given an ultimatum—work harder or lose her job.

issued the ultimatum that the project be finished by the following week, or it would be terminated

Recent Examples on the Web

The decision to remove the enormous mural near the White House comes after a U.S. Rep. Andrew Clyde, R-Ga., introduced legislation earlier this week that gave D.C. an ultimatum: either paint over the slogan or risk losing federal funding. —Juliana Kim, NPR, 8 Mar. 2025

President Donald Trump issued a final ultimatum to Hamas on Wednesday to release hostages. —Tommy Tuberville, Newsweek, 7 Mar. 2025

Which brings us to the album’s less enamored songs, the ones that go into what went wrong in a relationship that was so celebrated in the public eye, not least of all for how his spouse put up an ultimatum to sober up. —Chris Willman, Variety, 7 Mar. 2025

On Thursday’s episode of The Excerpt podcast: President Donald Trump issues a new ultimatum to Hamas. —Taylor Wilson, USA TODAY, 6 Mar. 2025

Word History

Etymology

New Latin, from Medieval Latin, neuter of ultimatus final

First Known Use

1731, in the meaning defined above

Rhymes for ultimatum

• latum
• verbatim

Kids Definition

ultimatum

noun

ul·​ti·​ma·​tum ˌəl-tə-ˈmāt-əm  -ˈmät- 

plural ultimatums or ultimata -ə 

: a demand that if rejected will bring about an end of peaceful talks and could lead to forceful action