This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A secret agreement between two or more parties for a fraudulent, illegal, or deceitful purpose.

n. A secret agreement for an illegal purpose; conspiracy.

n. A secret agreement and cooperation for a fraudulent or deceitful purpose; a playing into each other's hands; deceit; fraud; cunning.

n. An agreement between two or more persons to defraud a person of his rights, by the forms of law, or to obtain an object forbidden by law.

n. Secret agreement for a fraudulent or harmful purpose; a secret or crafty understanding for unworthy purposes.

n. Specifically, in law, a secret understanding between two or more persons to act or proceed as if adversely or at. variance with, or in apparent defiance of, one another's rights, in order to prejudice a third person or to obtain a remedy which could not as well be obtained by open concurrence.

n. secret agreement

n. agreement on a secret plot

"As news about the memo spread, critics of Hall and the school board quickly denounced what they described as collusion between the district and the chamber."

arrangement    agreement   

collude   

connivance    deceit    fraud    cunning   

allusion    conclusion    confusion    contusion    delusion    diffusion    disillusion    exclusion    extrusion    fusion   

duplicity    trickery    misrepresentation    prevarication    deception    dissimulation    charlatanism    bribery    misstatement    knavery