Any of various radical social or political movements that aim at fundamental change in the structure of society

plural of radicalism

In a radical manner; fundamentally; very. / At the root.

Favoring fundamental change, or change at the root cause of a matter. / (botany, not comparable) Pertaining to a root (of a plant). / Pertaining to the basic or intrinsic nature of something.

(historical, 19th-century Britain) A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism).

(transitive) To make radical. / (intransitive) To become radical; to adopt a radical political stance.

the process of radicalizing

present participle of radicalize

plural of radical

(transitive, rare) To cause to take root; to plant or establish firmly. / (intransitive, obsolete) To take root; to become established. / (transitive, arithmetic, rare) To extract the root of a number.