early 14c., from en- (1) + close (v.), and partially from Old French enclos, past participle of enclore "surround; confine; contain." Specific sense of "to fence in waste or common ground" for the purpose of cultivation or to give it to private owners is from c. 1500. Meaning "place a document with a letter for transmission" is from 1707. Related: Enclosed; enclosing.
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