radicalism Meaning, Definition & Usage

  1. noun the political orientation of those who favor revolutionary change in government and society

WordNet

Rad"i*cal*ism noun
Etymology
Cf. F. radicalisme.
Definitions
  1. 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.

Webster 1913