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A plaintiff (Π in legal shorthand) is the party who initiates a lawsuit (also known as an action) before a court. By doing so, the plaintiff seeks a legal remedy, and if successful, the court will issue judgment in favor of the plaintiff and make the appropriate court order (e.g., an order for damages). "Plaintiff" is the term used in civil cases in most English-speaking jurisdictions, the notable exception being England and Wales, where a plaintiff has, since the introduction of the Civil Procedure Rules in 1999, been known as a "claimant", but that term also has other meanings. In criminal cases, the prosecutor brings the case against the defendant, but the key complaining party is often called the "complainant".
In some jurisdictions the commencement of a lawsuit is done by filing a summons, claim form or a complaint. These documents are known as pleadings, that set forth the alleged wrongs committed by the defendant or defendants with a demand for relief. In other jurisdictions the action is commenced by service of legal process by delivery of these documents on the defendant by a process server; they are only filed with the court subsequently with an affidavit from the process server that they had been given to the defendant according to the rules of civil procedure.
In most English speaking jurisdictions, including Hong Kong, Nigeria, Australia, Canada and the United States, as well as in both Northern Ireland and the Republic of Ireland, the legal term "plaintiff" is still in use, as a general term for the party taking action in a civil case.
The word plaintiff can be traced to the year 1278 and stems from the Anglo-French word pleintif meaning "complaining". It was identical to "plaintive" at first and receded into legal usage with the -iff spelling in the 15th century.
In most common law jurisdictions, the term "claimant" used in England and Wales since 1999 (see below) is used only in specific, often non-judicial contexts. In particular, in American usage, terms such as "claimant" and "claim form" are limited to extrajudicial process in insurance and administrative law. After exhausting remedies available through an insurer or government agency, an American claimant in need of further relief would turn to the courts, file a complaint (thus establishing a real court case under judicial supervision) and become a plaintiff.
In England and Wales, the term "claimant" replaced "plaintiff" after the Civil Procedure Rules 1998 came into force on 26 April 1999. The move, which brings England and Wales out of line with general usage in English-speaking jurisdictions, was reportedly based on an assessment that the word "claimant" is more acceptable as "plain English" than the word "plaintiff". In Scottish law a plaintiff is referred to as a "pursuer" and a defendant as a "defender".
The party against whom the complaint is made is the defendant; or, in the case of a petition, a respondent. Case names are usually given with the plaintiff first, as in Plaintiff v. Defendant.
The similar term "complainant" denotes the complaining witness in a criminal proceeding.
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