Proviso

[Latin / Law / Noun]

It being provided

A condition or qualification attached to an agreement or statement

A clause in a statute, deed, or other legal document introducing a qualification or condition to some other provision, frequently the one immediately preceding the proviso itself

[A proviso] requires that something must occur or not occur before another part of the contractual agreement, or the entire legal instrument itself, can become valid

Proviso denotes from the Mediaeval Latin term proviso quod, meaning 'provided that' (e.g., provided x, then y)