clausen.[F. clause, LL. clausa, equiv. to L. clausula clause, prop., close of rhetorical period, close, fr. claudere to shut, to end. See Close.]1. A separate portion of a written paper, paragraph, or sentence; an article, stipulation, or proviso, in a legal document.()The usual attestation clause to a will. (Bouvier.)2. (Gram.) A subordinate portion or a subdivision of a sentence containing a subject and its predicate.()n. See Letters clause or Letters close, under Letter.()