activist

[ak-tuh-vist]
noun
1.
an especially active, vigorous advocate of a cause, especially a political cause.
adjective
2.
of or pertaining to activism or activists: an activist organization for environmental concern.
3.
advocating or opposing a cause or issue vigorously, especially a political cause: Activist opponents of the president picketed the White House.

Origin:
1905–10; active + -ist

nonactivist, adjective, noun

activist, pacifist, passivist.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
activism (ˈæktɪˌvɪzəm)
 
n
a policy of taking direct and often militant action to achieve an end, esp a political or social one
 
'activist
 
n

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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Etymonline
Word Origin & History

activist
"one who advocates a doctrine of direct action," 1915; from active (q.v.). Activism in this sense is first attested 1920; earlier (1907) it was used in ref. to a philosophical theory.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for activist
Activist tom hayden said, my own radical journey began with mad magazine.
Partial proceeds of the album were donated to ak and other activist groups.
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