D defs.my
Entry 1 sense Webster, 1913

Radicalism

/(răd"ĭ*kal*ĭz'm)/ · Rad·i·cal·ism · IPA /ˈradɪkəlɪz(ə)m/
01 n. The quality or state of being radical; specifically, the doctrines or principles of radicals in politics or social reform.
  1. 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.