Etymology
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activism (n.)

1920 in the political sense of "advocating energetic action;" see active + -ism. Earlier (1907) it was used in reference to a philosophical theory. Compare activist.

updated on October 21, 2016

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Definitions of activism from WordNet

activism (n.)
a policy of taking direct action to achieve a political or social goal;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.