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late 14c., "action, performance, work," also "the performance of some science or art," from Old French operacion "operation, working, proceedings," from Latin operationem (nominative operatio) "a working, operation," from past participle stem of operari "to work, labor" (in Late Latin "to have effect, be active, cause"), from opera "work, effort," related to opus (genitive operis) "a work" (see opus). The surgical sense is first attested 1590s. Military sense of "series of movements and acts" is from 1749.
operation op·er·a·tion (ŏp'ə-rā'shən)
A surgical procedure, usually using instruments, for remedying an injury, an ailment, a defect, or a dysfunction.
The act, manner, or process of functioning.