From Longman Dictionary of Contemporary Englishcomplainantcom‧plain‧ant /kəmˈpleɪnənt/ noun [countable] law SCTsomeone who makes a formal complaint in a court of law SYN plaintiff
Examples from the Corpus
complainant• Different areas of legislation and regulation affect the likelihood of success for complainants in judicial review.• It was a condition of his bail that he should not approach Bridget Coffey, the complainant.• In all but one he found for the complainant.• But what of the complainant who consciously fantasises about rape?• The prosecution no longer has to establish that the complainant resisted.• The judge made it clear that he thought the complainant was the truthful witness and that the case should continue.• The large number of court cases in which the complainant dropped the prosecution is an indication that many cases were settled informally.• The complainant had better grumble at those responsible, not at him.From Longman Business Dictionarycomplainantcom‧plain‧ant /kəmˈpleɪnənt/ noun [countable] British EnglishLAW a person who makes a complaint in a CIVIL LAW courtSYNPLAINTIFFIf the committee rejects a complaint, the complainant now has the right to apply for a rehearing. 