<p><strong>noun</strong></p><ul><li>a secret agreement, especially for fraudulent or treacherous purposes; conspiracy (e.g., Some of his employees were acting in collusion to rob him)<ul><li>Synonyms: complicity, connivance, intrigue</li></ul></li><li>Law: a secret understanding between two or more persons to gain something illegally, to defraud someone's rights, or to appear as adversaries though in agreement (e.g., collusion of husband and wife to obtain a divorce)</li></ul>