ticket

A ticket is a piece of paper that allows you to enter a train, airplane, show, etc.

Example: I bought my ticket to Mexico last week, but now I can't find it.

A ticket is a piece of paper that shows that you have parked your car in the wrong place or committed some other driving offence.

Example: The policeman gave me a ticket for going 125 km/h.

If you ticket someone, then you give someone a ticket for breaking a law.

Example: The officer ticketed the driver after he drove through a red light.