- Person with radical opinions.
- (Hist. " 19th-century England) A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism).
- (Hist. " Early 20th-century France) A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics.
- (mathematics) The root of a quantity as notated by âˆšn.
- (linguistics) In such logogram, logographic writing systems as the Chinese writing system, the portion of a character (if any) that provides an indication of its meaning; contrasted with phonetic.
- (linguistics) In Semitic languages, any one of the set of consonants (typically three) that make up a root.
- (chemistry) A group of atoms, joined by covalent bonds, that take part in reactions as a single unit.
- Of or pertaining to the root or root cause of the matter.
- Thorough going or fundamental.
- The spread of the cancer required radical surgery, and the entire organ was removed.
- Favouring fundamental change, or change at the root cause of the matter.
- His beliefs are radical.
- Slang: Extremely incredible.
- That was a radical jump!
Etymology: Latin radicalis.
- (chemistry) Involving free radicals
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Full Definition of radical