a formally drawn request, often bearing the names of a number of those making the request, that is addressed to a person or group of persons in authority or power, soliciting some favor, right, mercy, or other benefit: a petition for clemency; a petition for the repeal of an unfair law.
a request made for something desired, especially a respectful or humble request, as to a superior or to one of those in authority; a supplication or prayer: a petition for aid; a petition to God for courage and strength.
something that is sought by request or entreaty: to receive one's full petition.
Law. an application for a court order or for some judicial action.