• synonyms


or co-op·er·ate

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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


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

Related Words


Examples from the Web for cooperate

Contemporary Examples

Historical Examples

  • They could do almost everything except communicate and cooperate.

    The Issahar Artifacts

    Jesse Franklin Bone

  • Now we ought always to cooperate with the lead of the best, which is law.



  • I must really ask you to cooperate; I believe you fully capable.

  • I would like you to cooperate fully with Mr. Beardsley's line of approach.

  • Tell how a scout may cooperate with the board of health in preventing disease.

    Boy Scouts Handbook

    Boy Scouts of America

British Dictionary definitions for cooperate



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 cooperate


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