from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Operating to produce effects; effective.
  • adjective Psychology Of, relating to, or being a response that occurs spontaneously and is identified by its reinforcing or inhibiting effects.
  • noun One that operates.
  • noun Psychology An element of operant behavior.

from The Century Dictionary.

  • Working; engaged in action; active; operative; effective.
  • noun One who operates; an operator or operative; a worker or workman.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective rare, rare, rare Operative.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective That operates to produce an effect.
  • noun An operative person or thing.
  • noun psychology A class of behavior that produces consequences by operating (i.e., acting) upon the environment.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective having influence or producing an effect


from The American Heritage® Dictionary of the English Language, 4th Edition

[Latin operāns, operant-, present participle of operārī, to work; see operate.]



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