• synonyms


or co-op·er·ate

verb (used without object), co·op·er·at·ed, co·op·er·at·ing.
  1. to work or act together or jointly for a common purpose or benefit.
  2. to work or act with another or other persons willingly and agreeably.
  3. to practice economic cooperation.
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Origin of cooperate

1595–1605; < Late Latin cooperātus past participle of cooperārī to work with. See co-, operate
Related formsco·op·er·a·tor, co-op·er·a·tor, nounun·co·op·er·at·ing, adjective


Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


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.


    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 (intr)
  1. to work or act together
  2. to be of assistance or be willing to assist
  3. economics (of firms, workers, consumers, etc) to engage in economic cooperation
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Derived Formscooperator or 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

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.

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Online Etymology Dictionary, © 2010 Douglas Harper