Radical

Adjective

  • Pertaining to the basic or intrinsic nature of something.
  • (linguistics, not comparable, of a sound) Produced using the root of the tongue.
  • (slang, 1980s & 1990s) Excellent; awesome.

    "That was a radical jump!"

  • (botany, not comparable) Pertaining to a root (of a plant).
  • (linguistics, not comparable) Of or pertaining to the root of a word.
  • (mathematics) Relating to a radix or mathematical root.

    "a radical quantity; a radical sign"

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

    "His beliefs are radical."

  • Thoroughgoing.

    "The spread of the cancer required radical surgery, and the entire organ was removed."

  • (chemistry, not comparable) Involving free radicals.

Noun

  • (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).
  • (arithmetic) A root (of a number or quantity).
  • (chemistry) A group of atoms, joined by covalent bonds, that take part in reactions as a single unit.
  • A person with radical opinions.
  • (linguistics) In Semitic languages, any one of the set of consonants (typically three) that make up a root.
  • (historical: early 20th-century France) A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics.
  • ‚Äč(linguistics) In logographic writing systems as the Chinese writing system, the portion of a character (if any) that provides an indication of its meaning, as opposed to phonetic.
  • (organic chemistry) A free radical.

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