agreement,
arrangement compatibility of observations; "there was no agreement between theory and measurement"; "the results of two tests were in correspondence"
Collusion is an agreement between two or more persons, sometimes illegal and therefore secretive, to limit open competition by deceiving, misleading, or defrauding others of their legal rights, or to obtain an objective forbidden by law typically by defrauding or gaining an unfair advantage. It is an agreement among firms to divide the market, set prices, or limit production. It can involve "wage fixing, kickbacks, or misrepresenting the independence of the relationship between the colluding parties".
OmegaWiki Dictionary
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collusion A secret agreement between two or more parties for a fraudulent, illegal, or deceitful purpose.
