From Middle English necessarye, from Old French necessaire, from Latin necessārius ("unavoidable, inevitable, required"), variant of necesse, probably from ne or non cessus, from the perfect passive participle of cēdō; see cede.
Older use as a noun in reference to an outhouse or lavatory under the influence of English and Latin necessārium, a medieval term for the place for monks' "unavoidable" business, usually located behind or attached to monastic dormitories.
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