operative

adj. in working order; valid; influential; important; surgical; efficient

n. worker; craftsman; artisan; person who is employed secretly in spying for a government

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Noun
1. a person secretly employed in espionage for a government
(synonym) secret agent, intelligence officer, intelligence agent
(hypernym) agent
(hyponym) agent-in-place
2. someone who can be employed as a detective to collect information
(synonym) private detective, PI, private eye, private investigator, shamus, sherlock
(hypernym) detective
(hyponym) hotel detective, house detective, house dick

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Adjective
1. being in force or having or exerting force; "operative regulations"; "the major tendencies operative in the American political system"
(antonym) inoperative
(similar) at work(p), operant
2. of or relating to a surgical operation; "operative surgery"
(pertainym) operation, surgery, surgical operation, surgical procedure, surgical process
3. relating to or requiring or amenable to treatment by surgery especially as opposed to medicine; "a surgical appendix"; "a surgical procedure"; "operative dentistry"
(synonym) surgical
(similar) preoperative
4. effective; producing a desired effect; "the operative word"
(synonym) key
(similar) significant, important
5. (of e.g. a machine) performing or capable of performing; "in running (or working) order"; "a functional set of brakes"
(synonym) running(a), functional, working(a)
(similar) functioning

adj. operative, surgical; operational, strategic

adj. operative, in working order, valid, influential