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

  • noun The act or practice of cooperating.
  • noun The association of persons or businesses for common, usually economic, benefit.

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

  • noun The act of cooperating or being cooperative.
  • noun Active help from a person, organization, et cetera.
  • noun An orderly sharing of space or resources.
  • noun Association for mutual benefit, such as for purposes of production or purchase.


from Wiktionary, Creative Commons Attribution/Share-Alike License

1620–30, from Middle French cooperation, from Late Latin cooperatio


  • When Tit-for-Tat is inoperative, anarchism can achieve mutual cooperation only if all agents always choose to act cooperatively even when its physically possible to defect and exploit others 'cooperation*.

    Planet Atheism

  • We can only hope that Calderon can throw the cartels on the defensive, gain cooperation from a frightened public which is reluctant to trust police, and start controlling the drug kingpins -- whose organizations seem in the meantime to be decentralizing and squabbling over territory.

    Concern for MX Govt

  • The word cooperation means to work together toward a common end or purpose; however, I found that some of the students acted as if their common purpose was to put an end to my work!

    How to Talk so Kids Can Learn

  • Practice in cooperation is what will give the United Nations its character.

    The Nobel Peace Prize 1946 - Presentation Speech

  • The U.S. believes the cooperation is a good thing and won't undermine its close military relationship with the U.K.,

    U.K., France Move Closer on Defense

  • I mean, I don't know what they call cooperation if that's not cooperating.

    CNN Transcript - Larry King Live: Will JonBenet Ramsey's Murder Ever Be Solved? - May 4, 2000

  • This cooperation is achieved partly by cells communicating with each other through chemical signals.

    Physiology or Medicine 1994 - Press Release

  • That is what we call cooperation among the industries.


  • I do know that French Canadians feel proud that they are cooperating with the rest of us and that perhaps for the first time their cooperation is appreciated.

    This Democratic Empire

  • Last week, the two countries pledged what they called cooperation on humanitarian issues, more than a year after the deadly 2008 terror strikes in Mumbai froze their peace dialogue.


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