col·lab·o·rate

[kuh-lab-uh-reyt]
verb (used without object), col·lab·o·rat·ed, col·lab·o·rat·ing.
1.
to work, one with another; cooperate, as on a literary work: They collaborated on a novel.
2.
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.

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

col·lab·o·ra·tor, noun

collaborate, corroborate.


2. collude, join, assist, abet.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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independent, real or actual; of considerable amount or quantity
constant in effort to accomplish something; attentive and persistent in doing anything; done or pursued with persevering attention
Collins
World English Dictionary
collaborate (kəˈlæbəˌreɪt) [Click for IPA pronunciation guide]
 
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]
 
col'laborative
 
adj
 
col'laborator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

collaborate
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
We need an effective mechanism for people and organizations to collaborate in
  order to solve the challenges facing our world.
Even within the media conglomerates, units compete aggressively rather than
  collaborate.
Certainly in his adult work colour and nature often collaborate.
Follow an educated hunch, and collaborate with a colleague who has the
  knowledge you lack.
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