Definition of collusion noun from the Oxford Advanced Learner's Dictionary

 

collusion

 noun
noun
BrE BrE//kəˈluːʒn//
 
; NAmE NAmE//kəˈluːʒn//
 
[uncountable](formal, disapproving)
 
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secret agreement especially in order to do something dishonest or to trick people The police were corrupt and were operating in collusion with the drug dealers. There was collusion between the two witnesses (= they gave the same false evidence). Word Origin late Middle English: from Latin collusio(n-), from colludere ‘have a secret agreement’, from col- ‘together’ + ludere ‘to play’.
See the Oxford Advanced American Dictionary entry: collusion