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

complainant

noun
 
/kəmˈpleɪnənt/
 
/kəmˈpleɪnənt/
(also more frequent plaintiff)
(law)
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  1. a person who makes a formal complaint against somebody in courtTopics Law and justicec2
    Word Originlate Middle English: from French complaignant, present participle of complaindre ‘to lament’, from medieval Latin complangere ‘bewail’, from Latin com- (expressing intensive force) + plangere ‘to lament’.
See complainant in the Oxford Advanced American DictionarySee complainant in the Oxford Learner's Dictionary of Academic English

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