Webster's English Dictionary

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collusion

col.lu.sion \k*-'lu:-zh*n\ \-'lu:-siv, -ziv\ n [ME, fr. MF, fr. L 
   collusion-, collusio, fr. collusus, pp. of] colludere : secret agreement or 
   cooperation for a fraudulent or deceitful purpose  - col.lu.sive aj