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English definition of “vigilante”

vigilante

noun [C] uk   /ˌvɪdʒ.ɪˈlæn.ti/ us    /-ˈlæn.t̬i/
a person who tries in an unofficial way to prevent crime, or to catch and punish someone who has committed a crime, especially because they do not think that official organizations, such as the police, are controlling crime effectively. Vigilantes usually join together to form groups.
vigilantism
noun [U] uk   /-tɪ.zəm/ us    /-t̬ɪ.zəm/
(Definition of vigilante from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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