Proviso

A condition, stipulation, or limitation inserted in a document.

A condition or a provision in a deed, lease, mortgage, or contract, the performance or non-performance of which affects the validity of the instrument. It generally begins with the word provided.

A proviso clause in a statute excepts something from statutory requirements, qualifies the statute, or excludes some potential area of misinterpretation.

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proviso n. a term or condition in a contract or title document.

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PROVISO. The name of a clause inserted in an act of the legislature, a deed, a written agreement, or other instrument, which generally contains a condition that a certain thing shall or shall not be done, in order that an agreement contained in another clause shall take effect.
     2. It always implies a condition, unless subsequent words change it to a covenant; but when a proviso contains the mutual words of the parties to a deed, it amounts to a covenant. 2 Co. 72; Cro. Eliz. 242; Moore, 707 Com. on Cov. 105; Lilly's Reg. h.t.; 1 Lev. 155.
     3. A proviso differs from an exception. 1 Barn. k Ald. 99. An exception exempts, absolutely, from the operation of an engagement or an enactment; a proviso defeats their operation, conditionally. An exception takes out of an engagement or enactment, something which would otherwise be part of the subject-matter of it; a proviso avoids them by way of defeasance or excuse. 8 Amer. Jurist, 242; Plowd. 361; Carter 99; 1 Saund. 234 a, note; Lilly's Reg. h.t.; and the cases there cited. Vide, generally Amer. Jurist, No. 16, art. 1; Bac. Ab. Conditions, A; Com. Dig. Condition, A 1, A 2; Darw. on Stat. 660.