petition

A petition is a written request to change something.

A petition is a list of signatures showing support for something or opposition against it.

Example: Please sign our petition to get a new snack machine in the school cafeteria.

A petition is a written document that people sign to show that they want a person or organization to do or change something.

Example: In honor of his memory, a petition has been sent to persuade the Postal Services Stamp Advisory Committee to put Willis Conover on a U.S. postage stamp.

To petition for something is to make a request for it, usually in writing.

Example: You should petition for a shorter work week.