Definition of vigilante noun from the Oxford Advanced American Dictionary

 

vigilante

 noun
noun
NAmE//ˌvɪdʒəˈlænti//
 
(sometimes disapproving)
 
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a member of a group of people who try to prevent crime or punish criminals in their community, especially because they think the police are not doing this vigilantes patrolling the streets vigilante groups
vigilantism
 
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NAmE//ˌvɪdʒəˈlæntɪzəm//
 
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: vigilante