Petition can also be the title of a legal pleading that initiates a legal case. The initial pleading in a civil lawsuit that seeks only money (damages) might be called (in most U.S. courts) a complaint. An initial pleading in a lawsuit that seeks non-monetary or "equitable" relief, such as a request for a writ of mandamus or habeas corpus, custody of a child, or probate of a will, is instead called a petition.
Printed copy · Anthology Volume 4, page 1028Printed copy from The Tender For Law Anthology, Volume 4, page 1028 (printed 13 June 2014). Added by this site; not part of the Facebook export.