Noun
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someone who can be employed as a detective to collect information
- private detective - private eye - private investigator -
a person secretly employed in espionage for a government
- secret agent - intelligence officer - intelligence agent
Adjective
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(of e.g. a machine) performing or capable of performing
"in running (or working) order"
"a functional set of brakes"
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effective
producing a desired effect
"the operative word"
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relating to or requiring or amenable to treatment by surgery especially as opposed to medicine
"a surgical appendix"
"a surgical procedure"
"operative dentistry"
-
being in force or having or exerting force
"operative regulations"
"the major tendencies operative in the American political system"