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
Furthermore, the colonists had virtually no history of cooperating with one
  another, even in the face of danger.
People started to make deals for themselves by cooperating.
His brain-imaging studies have revealed a potential connection between the act
  of cooperating and the brain's reward centers.
Maintaining friendly relations, sharing resources, and cooperating led to new
  patterns of social organization.
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