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
Add a collaborator by clicking on the plus sign highlighted in green.
He agreed, and since that time he's been a full-time collaborator for us.
Must be an experienced administrator and leader, a proven coach and teacher, an
  effective communicator and collaborator.
We are seeking that unique individual who is an energetic, engaged thought
  leader, convener and collaborator.
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