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1. A plaintiff.
2. A prosecuting witness in a criminal case.
3. A person who files a formal accusation or brings a formal charge.
(Law) law a person who makes a complaint, usually before justices; plaintiff
a person, group, or company that makes a complaint, as in a legal action.
[1375–1425; late Middle English < Anglo-French]
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|Noun||1.||complainant - a person who brings an action in a court of law|
law, jurisprudence - the collection of rules imposed by authority; "civilization presupposes respect for the law"; "the great problem for jurisprudence to allow freedom while enforcing order"
litigant, litigator - (law) a party to a lawsuit; someone involved in litigation; "plaintiffs and defendants are both litigants"