Connivance
/kəˈnaɪvəns/
Definition 1 of 2
Pro Tip 1/3Secret Involvement
Refers to silent participation in wrongdoing, often to gain benefits. 
He was accused of connivance in the financial fraud at the company.
Pro Tip 2/3Collaborative Intent
Implies a mutual understanding between parties to permit something illicit. 
The deal was made with the connivance of insiders keen on profiting illegally.
Pro Tip 3/3Intentionally Overlooked
Suggests an intentional decision not to act against a wrongdoing. 
With the teacher's connivance, students cheated on the exam.