proviso

A clause in a document imposing a qualification, condition, or restriction.

A clause making what precedes conditional on what follows; a provision or article in a statute, contract, or other writing, by which a condition is introduced; a conditional stipulation that affects an agreement, law, grant, etc.

Nautical, a stern-fast or hawser carried to the shore, to steady a ship.

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.

A conditional provision to an agreement

a stipulated condition