n (rfc-sense)(grammar|informal) A group of two or more words which include a subject and any necessary predicate (the predicate also includes a verb, conjunction, or a preposition) to begin the clause; however, this clause is not considered a sentence for colloquial purposes.
n (grammar) A verb along with its subject and their modifiers. If a clause provides a complete thought on its own, then it is an independent (superordinate) clause; otherwise, it is (subordinate) dependent.
n (legal) A separate part of a contract, a will or another legal document.