Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Language: Modern Latin
Origin: Late Latin ultimatus; ULTIMATE1

ultimatum

 noun
     
ul‧ti‧ma‧tum plural ultimatums or ultimata [countable]
a threat saying that if someone does not do what you want by a particular time, you will do something to punish them:
Well, give him an ultimatum: either he pays by Friday or he finds somewhere else to live.
The army issued an ultimatum for all weapons in the city to be surrendered on Oct. 26.
Definition from the Longman Dictionary of Contemporary English
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