Plaintiff

A person or business that files a formal complaint with the court.

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Additional Sources

Answers.com

The party that institutes a suit in a court.

Duhaime Legal Dictionary

The person who starts, brings an case to court; who sues or who asks the Court for a trial and, if successful, enforceable relief.

Law.com Dictionary

n. the party who initiates a lawsuit by filing a complaint with the clerk of the court against the defendant(s) demanding damages, performance and/or court determination of rights

Lawyers.com

The party who institutes a legal action or claim.

Lect Law Library

PLAINTIFF - The person who initiates a lawsuit. The person who initiates a lawsuit by filing a complaint is called the plaintiff. When the document that initiates a lawsuit is called a petition rather than a complaint, the initiating person is usually referred to as the petitioner rather than the plaintiff.

Legal-Dictionary.org

The complaining party in a civil law suit.