RADICALISM
radicalism
(noun) the political orientation of those who favor revolutionary change in government and society
Source: WordNet® 3.1
Etymology
Noun
radicalism (countable and uncountable, plural radicalisms)
Any of various radical social or political movements that aim at fundamental change in the structure of society
Source: Wiktionary
Rad"i*cal*ism, n. Etym: [Cf. F. radicalisme.]
Definition: The quality or state of being radical; specifically, the
doctrines or principles of radicals in politics or social reform.
Radicalism means root work; the uprooting of all falsehoods and
abuses. F. W. Robertson.
Source: Webster’s Unabridged Dictionary 1913 Edition