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

• demand
• request
• requirement

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

Because your wonderful man’s body odor is offensive, give him an ultimatum. —Abigail Van Buren, Boston Herald, 23 Oct. 2025

Faced with Jana’s ultimatum, Mackey and his leadership team considered multiple options. —Dave Smith, Fortune, 23 Oct. 2025

Back when El Matador won the title, Dana White was dismissive of the ultimatum coming from Justin Gaethje's camp. —Evan Bell, MSNBC Newsweek, 18 Oct. 2025

Ellison's office's lack of substantive response to the ultimatum comes despite the fact that hundreds of Minnesota school board members penned an open letter urging the state to comply with Trump and change its policies to keep males out of girls sports. —Jackson Thompson, FOXNews.com, 11 Oct. 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