What is another word for "proviso"?

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