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.
Also, co-operate.

1595–1605; < Late Latin cooperātus past participle of cooperārī to work with. See co-, operate

cooperator, co-operator, noun
uncooperating, adjective

2. collaborate, join, participate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cooperate or co-operate (kəʊˈɒpəˌreɪt)
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
[C17: from Late Latin cooperārī to work with, combine, from Latin operārī to work]
co-operate or co-operate
[C17: from Late Latin cooperārī to work with, combine, from Latin operārī to work]
co'operator or co-operate
co-'operator or co-operate

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1610s, from L. cooperat-, pp. stem of cooperari (see cooperation). Related: Cooperating (1640s).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
One defendant has died, and two have entered guilty pleas and agreed to
  cooperate with the authorities.
To say that our ancestors lived in a zero sum world is to say that they did not
Few of our closest relatives, the great apes, cooperate with each other as
  extensively as meerkats.
Humans cooperate on all sorts of issues and tasks, but every so often a member
  of the group fails to pull his weight.
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