late 14c., disclosen, "to uncover and expose to view, open to the knowledge of others," from Old French desclos "open, exposed, plain, explicit," past participle of desclore (Modern French déclore) "open, break open, unlock, reveal," from des- "opposite of" (see dis-) + clore "to close" (see close (v.)). Related: Disclosed; disclosing.
late 14c., "a barrier, a fence," from Old French closure "enclosure; that which encloses, fastening, hedge, wall, fence," also closture "barrier, division; enclosure, hedge, fence, wall" (12c., Modern French clôture), from Late Latin clausura "lock, fortress, a closing" (source of Italian chiusura), from past participle stem of Latin claudere "to close" (see close (v.)).
Sense of "act of closing, a bringing to a close" is from early 15c. In legislation, especially "closing or stopping of debate" (compare cloture). Sense of "tendency to create ordered and satisfying wholes" is 1924, from Gestalt psychology.
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Harper, D. (n.d.). Etymology of disclosure. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/disclosure