Definition of plaintiff noun from the Oxford Advanced Learner's Dictionary

 

plaintiff

 noun
noun
BrE BrE//ˈpleɪntɪf//
 
; NAmE NAmE//ˈpleɪntɪf//
 
(less frequent complainant)(law)
 
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a person who makes a formal complaint against somebody in court The court upheld the plaintiff’s claim for damages. The plaintiff must prove that the defendant was negligent. compare defendant Word Origin late Middle English: from Old French plaintif ‘plaintive’ (used as a noun). The -f ending has come down through Law French; the word was originally the same as plaintive.Extra examples The plaintiff claimed that the correct procedures had not been followed. The plaintiffs obtained an injunction in the High Court. the lawyer appearing on behalf of the plaintiff
See the Oxford Advanced American Dictionary entry: plaintiff