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plural complainants
(law) The party that brings a civil lawsuit against another; the plaintiff. examples
(law) An alleged victim in a criminal investigation or trial. examples
One who makes complaint. quotations examples
Eager complainants […] in the dispute.
1708-1714 Jeremy Collier, Ecclesiastical History of Great Britain
The Southern Region takes, in the main, a candid line with its public. [...] An ill-informed attempt to blackguard the railway publicly is likely to see the complainant put politely—but very firmly—in his place.
1962 August, “Let's have plain speaking”, in Modern Railways, page 73