a member of a vigilance committee.
any person who takes the law into his or her own hands, as by avenging a crime.
done violently and summarily, without recourse to lawful procedures: vigilante justice.

1825–35, Americanism; < Spanish: vigilant

vigilanteism, vigilantism [vij-uh-lan-tiz-uhm, vij-uh-luhn-tiz-uhm] , noun

vigilant, vigilante. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vigilante (ˌvɪdʒɪˈlæntɪ)
1.  one of an organized group of citizens who take upon themselves the protection of their district, properties, etc
2.  (US) Also called: vigilance man a member of a vigilance committee
[C19: from Spanish, from Latin vigilāre to keep watch]

vigilantism (ˌvɪdʒɪˈlænˌtɪzəm)
(US) the methods, conduct, attitudes, etc, associated with vigilantes, esp militancy, bigotry, or suspiciousness

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"member of a vigilance committee," 1856, Amer.Eng., from Sp. vigilante, lit. "watchman," from L. vigilantem (see vigilance). Vigilant man in same sense is attested from 1824 in a Missouri context. Vigilance committees kept informal rough order on the frontier or in other
places where official authority was imperfect.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It strikes me as a type of misguided, self-righteous vigilantism.
Vigilantism is never okay, and the ends do not justify the means.
But vigilantism is a risky business, particularly when it carries an odor of
  race baiting.
Penalties for vigilantism or other misuse of information obtained under this
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