Contravention is a noun that refers to an action that violates a law or treaty. 

The Latin prefix C-O-N-T-R-A means ‘against and the Latin word venire (vay NEAR ay) means ‘come.’ A contravention is any violation of rules. Example:

After a few contraventions, Harry found himself in so much trouble, he straightened up right away. Getting caught breaking the law has a way of changing people’s behavior.