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or co-operate

[koh-op-uh-reyt] /koʊˈɒp əˌreɪt/
verb (used without object), cooperated, cooperating.
to work or act together or jointly for a common purpose or benefit.
to work or act with another or other persons willingly and agreeably.
to practice economic cooperation.
Origin of cooperate
1595-1605; < Late Latin cooperātus past participle of cooperārī to work with. See co-, operate
Related forms
cooperator, co-operator, noun
uncooperating, adjective
2. collaborate, join, participate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for cooperated
Contemporary Examples
Historical Examples
  • Mr. Work has cooperated with me in the most thoroughgoing manner.

  • As soon as he perceived her intent, he cooperated enthusiastically.

    Masters of Space Edward Elmer Smith
  • They cooperated quite willingly, if not always too intelligently.

    A Slave is a Slave Henry Beam Piper
  • But the most pleasing thing of all was the way they cooperated with one another.

    Cerebrum Albert Teichner
  • Grizek was dead, but Bassett and Tom Lowery remained and they cooperated.

    This Crowded Earth Robert Bloch
British Dictionary definitions for cooperated


verb (intransitive)
to work or act together
to be of assistance or be willing to assist
(economics) (of firms, workers, consumers, etc) to engage in economic cooperation
Derived Forms
cooperator, co-operator, noun
Word Origin
C17: from Late Latin cooperārī to work with, combine, from Latin operārī to work
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for cooperated



also co-operate, c.1600, from Late Latin cooperatus, past participle of cooperari "to work together with" (see cooperation). Related: Cooperated; cooperating.

Online Etymology Dictionary, © 2010 Douglas Harper
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