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English definition of “perpetrator”

perpetrator

noun [C]     /ˈpɜː.pə.treɪ.tər/ US  /ˈpɝː.pə.treɪ.t̬ɚ/ (US old-fashioned slang perp) formal
someone who has committed a crime or a violent or harmful act : The perpetrators of the massacre must be brought to justice as war criminals .Criminals - general words
(Definition of perpetrator noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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