a secret agreement, especially for fraudulent or treacherous purposes; conspiracy: Some of his employees were acting in collusion to rob him.
Law. a secret understanding between two or more persons to gain something illegally, to defraud another of his or her rights, or to appear as adversaries though in agreement: collusion of husband and wife to obtain a divorce.

1350–1400; Middle English (< Middle French) < Latin collūsiōn- (stem of collūsiō), equivalent to collūs(us) (past participle of collūdere to collude) + -iōn- -ion

noncollusion, noun
precollusion, noun

collision, collusion.

1. intrigue, connivance, complicity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
collusion (kəˈluːʒən)
1.  secret agreement for a fraudulent purpose; connivance; conspiracy
2.  a secret agreement between opponents at law in order to obtain a judicial decision for some wrongful or improper purpose
[C14: from Latin collūsiō, from collūdere to collude]

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

1389, from O.Fr. collusion, from L. collusionem "act of colluding," from colludere, from com- "together" + ludere "to play," from ludus "game" (see ludicrous).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There are a thousand questions about how to prevent collusion and other sorts
  of price manipulation.
The costs of collusion should make any boss think twice, though.
In good times industrial collusion, overseen by bureaucrats, is practically
  official policy.
Quiet diplomacy might work, but it can also let topics slip by and leave a
  public perception of indifference or collusion.
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