(n.) A condition in a contract or will\; an article or clause in any statute, agreement, contract, grant, or other writing, by which a condition is introduced, usually beginning with the word provided; a conditional stipulation that affects an agreement, contract, law, grant, or the like; as, the contract was impaired by its proviso.

bill boundary condition calendar catch clause companion bills amendment condition donnee dragnet clause enacting clause escalator clause escape clause escape hatch exception fine print given grounds hold-up bill joker kicker limiting condition motion obligation omnibus bill parameter prerequisite privileged question provision provisions qualification question requisite reservation rider saving clause sine qua non small print specification stipulation string strings term terms ultimatum whereas