Etymology
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radicalism (n.)

"state or character of being radical," in any sense, 1819, from radical (adj.) + -ism. Originally, and especially, in the political sense of "holding or carrying out of extreme principles on any subject."

updated on March 30, 2021

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Definitions of radicalism from WordNet

radicalism (n.)
the political orientation of those who favor revolutionary change in government and society;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.