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radical

/ˈɹædɪkəl/
noun
  1. (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).

  2. (historical: early 20th-century France) A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics.

  3. A person with radical opinions.

adjective
  1. Favoring fundamental change, or change at the root cause of a matter.

    "His beliefs are radical."

  2. Pertaining to a root (of a plant).

  3. Pertaining to the basic or intrinsic nature of something.

    Similar: fundamental

Synonymsprimitive, fundamental
Antonymsderivative, derived, ignorable, trivial

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