Plaintiff definition in Law - the person who called "Petitioner" or "First party" in court who presents a petition to a court…

Plaintiff is the person who filed the original court action. That's also called "Petitioner" or "First party"
in court who presents a petition to a court or other body either to institute an equity proceeding or to
take an appeal from a judgment. The person who initially brings the suit personal action in court; act as
seeking the remedy of justice for an injury, dispute, complaint or withholding that of his or her rights.

In Family Court, a plaintiff is a person asking for an order of protection. (Cases filed for an order of
protection are called family offense cases.) He or she must raise the entire reasons (grounds for
complaint) and evidence for filing the case in court.

The adverse party is called the respondent, is a person a petitioner wants an order of protection
against. In a Criminal Court, that person is called a defendant.