What is another word for "ultimatum"?

Roget's Thesaurus (1911) lists these synonyms for "ultimatum": agreement, bind, casus, come, condition, conditional, conditionally, contract, covenant, guarded, insist, make, memorandum, non, obligation, point, pro, provisional, provisionally, proviso, qua, qualification, sine, stipulate, stipulation, string, tie, upon, with.