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Definition of ultimatum : A final proposition, concession, or condition; especially, the final propositions, conditions, or terms, offered by either of the parties in a diplomatic negotiation; the most favorable terms a negotiator can offer, the rejection of which usually puts an end to the hesitation.

Synonyms:

requirement, importunity, announcement, allegation, requisition, dun, apology, affirmation, assertion, assurance, attestation, avowal, final offer, accusation, term, claim, apologia

Usage examples:

• A week or more ago Austria Hungary sent an ultimatum to the Serbian government, to which an unsatisfactory reply was received. - "The Secret Witness", George Gibbs.
• One was an appeal to his troops to prevent desertion among the country folk who felt it imperative to get in their crops; the other was an ultimatum to Hull summoning him to surrender. - "The Niagara River", Archer Butler Hulbert.
• My financial agent wires me that the Press will announce to- morrow that Austria has presented an ultimatum to Servia demanding an answer within forty- eight hours. - "The Major", Ralph Connor.