An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) Grammar: A syntactic construction containing a subject and predicate and forming part of a sentence or constituting a whole simple sentence.
2) A distinct article or provision in a contract, treaty, will, or other formal or legal written document (Dictionary.com).

M.E., from O.Fr. clause, from M.L. clausa "conclusion," used in the sense of classical L. clausula "the end, a closing, termination," also "end of a sentence or a legal argument," from clausa, from p.p. of claudere "to close, to shut, to conclude," → closure.

Band present stem of bastan "to close, to fasten, to bind," → closure.