/keuh looh"zheuhn/ , n.
1. a secret agreement, esp. for fraudulent or treacherous purposes; conspiracy: Some of his employees were acting in collusion to rob him.
2. 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; ME ( collusion- (s. of collusio ), equiv. to collus ( us ) (ptp. of colludere to COLLUDE) + -ion- -ION ]
Syn. 1. intrigue, connivance, complicity.