Definitions
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noun 
  1. Person with radical opinions.
  2. (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).
  3. (Hist. " Early 20th-century France) A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics.
  4. (mathematics) The root of a quantity as notated by ân.
  1. (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.
    1. (linguistics) In Semitic languages, any one of the set of consonants (typically three) that make up a root.
    2. (chemistry) A group of atoms, joined by covalent bonds, that take part in reactions as a single unit.
adjective 
  1. Of or pertaining to the root or root cause of the matter.
  2. Thorough going or fundamental.
The spread of the cancer required radical surgery, and the entire organ was removed.
  1. Favouring fundamental change, or change at the root cause of the matter.
His beliefs are radical.
  1. Slang: Extremely incredible.
That was a radical jump!
  1. (chemistry) Involving free radicals
Etymology: Latin radicalis.


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