: a person who brings a legal action compare defendant
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We won't complain about the origins of plaintiff, although complain and plaintiff are distantly related; both can be traced back to plangere, a Latin word meaning "to strike, beat one's breast, or lament." Plaintiff comes most immediately from Middle English plaintif, itself an Anglo-French borrowing tracing back to plaint, meaning "lamentation." (The English word plaintive is also related.) Logically enough, plaintiff applies to the one who does the complaining in a legal case.
the judge ruled that the plaintiff's lawsuit was groundless, and he dismissed it
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Kansas City law firm Paul LLP, which represented plaintiffs in that suit, is now assisting NCA All-Star attendees weighing legal action against Varsity and the city of Dallas for alleged negligence in securing the event.—Daniel Libit, Sportico.com, 15 Mar. 2025 Supporters of the bill who attended the hearing included the Florida Medical Association, which represents physicians, the Merlin Law Group, a plaintiffs firm, and the Florida Justice Association, a trade and lobbying group for plaintiffs attorneys.—Ron Hurtibise, Sun Sentinel, 14 Mar. 2025 The plaintiff in that case, Stella Liebeck, was originally awarded nearly $3 million.—Ramishah Maruf, CNN, 14 Mar. 2025 Williams and the other plaintiffs voluntarily dismissed the case later the same year.—Kacen Bayless, Kansas City Star, 14 Mar. 2025 See All Example Sentences for plaintiff
Word History
Etymology
Middle English plaintif, from Anglo-French, from pleintif, adjective
Middle French plaintif, from plaintif, adj., grieving, from plaint lamentation, from Latin planctus, from plangere to strike, beat one's breast, lament
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