operative

[op-er-uh-tiv, op-ruh-tiv, op-uh-rey-tiv]
noun
1.
a person engaged, employed, or skilled in some branch of work, especially productive or industrial work; worker.
2.
a detective.
3.
a secret agent; spy.
adjective
4.
operating, or exerting force, power, or influence.
5.
having force; being in effect or operation: laws operative in this city.
6.
effective or efficacious.
7.
engaged in, concerned with, or pertaining to work or productive activity.
8.
significant; key: The operative word in that sentence is “sometimes.”
9.
Medicine/Medical. concerned with, involving, or pertaining to surgical operations.

Origin:
1590–1600; < Middle French operatif < Latin operāt(us) (see operate) + Middle French -if -ive

operatively, adverb
operativeness, operativity [op-er-uh-tiv-i-tee] , noun
interoperative, noun, adjective
nonoperative, adjective
unoperative, adjective


1. workman, factory hand. 2. investigator, agent. 6. effectual, serviceable.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
operative (ˈɒpərətɪv)
 
adj
1.  in force, effect, or operation
2.  exerting force or influence
3.  producing a desired effect; significant: the operative word
4.  of or relating to a surgical procedure
 
n
5.  a worker, esp one with a special skill
6.  (US) a private detective
 
'operatively
 
adv
 
'operativeness
 
n
 
opera'tivity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

operative
1598, "producing the intended effect," from L.L. operativus "creative, formative," from operatus, pp. of operari (see operation). Weakened sense of "significant, important" is from 1955. The noun meaning "worker, operator" is from 1809; sense of "secret agent, spy" is
first attested 1930, probably from its use by the Pinkerton Detective Agency as a title for their private detectives (1905).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

operative op·er·a·tive (ŏp'ər-ə-tĭv, -ə-rā'tĭv, ŏp'rə-)
adj.

  1. Of, relating to, or resulting from a surgical operation.

  2. Functioning effectively; efficient.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
There seem to be two basically different views of intuition operative here.
My insurance did not provide for post operative therapy.
Obviously some laws would have to change to allow these proposals to be fully
  operative.
The operative point being the need for more data and more experimental studies.
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