Webster’s Revised Unabridged Dictionary · 1913
Radicalism
Rad′i·cal·ism (-ĭz'm), 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.