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
Some writers have collaborated with musicians to create authorized
  book-soundtrack pairings.
Hacker have collaborated once again to share what has helped us work through
  and enjoy the time in between traditional semesters.
Some collaborated with ethologists and psychologists to put the study of
  childhood on an ever-firmer base of empirical evidence.
Professionally, she collaborated with different music producers and tried out a
  new manager.
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