verb (used without object), collaborated, collaborating.
to work, one with another; cooperate, as on a literary work: They collaborated on a novel.
to cooperate, usually willingly, with an enemy nation, especially with an enemy occupying one's country: He collaborated with the Nazis during World War II.

1870–75; < Late Latin collabōrātus (past participle of collabōrāre), equivalent to col- col-1 + labor work + -ātus -ate1

collaborator, noun

collaborate, corroborate.

2. collude, join, assist, abet. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
collaborate (kəˈlæbəˌreɪt)
vb (often foll by on, with, etc)
1.  to work with another or others on a joint project
2.  to cooperate as a traitor, esp with an enemy occupying one's own country
[C19: from Late Latin collabōrāre, from Latin com- together + labōrāre to work]

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

1871, back-formation from collaborator (1802), from Fr. collaborateur, from L. collaboratus, pp. of collaborare "work with," from com- "with" + labore "to work."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Knight refused to have collaborators and rejected almost all criticism.
Field and his collaborators had established that bats were the reservoir.
Second, the library sees its users as collaborators in improving the
  collections the library already has.
Minter was part of the long line of would-be collaborators too, as he explains.
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