collusion

 
Pronunciation: /kəˈl(j)uːʒ(ə)n/

noun

[mass noun]
  • secret or illegal cooperation or conspiracy in order to deceive others: the armed forces were working in collusion with drug traffickers
  • Law collusion between ostensible opponents in a lawsuit.

Derivatives

collusive

adjective

collusively

adverb

Origin:

late Middle English: from Latin collusio(n-), from colludere 'have a secret agreement' (see collude)