激進主義
Radicalism \Rad"i*cal*ism\, n. [Cf. F. radicalisme.] 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.
radicalism n : the political orientation of those who favor revolutionary change in government and society