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Learn to pronounce rad·i·cal

/ˈradək(ə)l/
adjective
  1. (especially of change or action) relating to or affecting the fundamental nature of something; far-reaching or thorough.
    "a radical overhaul of the existing regulatory framework"
    synonyms: thoroughgoing, thorough, complete, total, entire, absolute, utter, comprehensive, exhaustive, root-and-branch, sweeping, far-reaching, wide-ranging, extensive, profound, drastic, severe, serious, major, desperate, stringent, violent, forceful, rigorous, draconian
  2. advocating or based on thorough or complete political or social change; representing or supporting an extreme or progressive section of a political party.
    synonyms: revolutionary, progressive, reforming, reformist, progressivist, revisionist, leftist, left-wing, socialist, anticapitalist, extremist, fanatical, militant, diehard, woke, right-on, commie, Bolshevik, lefty, red, pink, bolshie
  3. denoting or relating to the roots of a word.
  4. of the root of a number or quantity.
  5. of, or springing direct from, the root or stem base of a plant.
  6. very good; excellent.
    "Okay, then. Seven o'clock. Radical!"

noun
  1. a person who advocates thorough or complete political or social reform; a member of a political party or part of a party pursuing such aims.
    synonyms: revolutionary, progressive, reformer, revisionist, leftist, left-winger, socialist, militant, zealot, extremist, fanatic, diehard, commie, Bolshevik, lefty, red, pinko
  2. a group of atoms behaving as a unit in a number of compounds.
  3. the root or base form of a word.
  4. a quantity forming or expressed as the root of another.

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1. of, relating to, or proceeding from a root: such as a (1) : of or growing from the root of a plant radical tubers (2) : growing from the base of a stem.
Radical comes from a Latin word meaning "root," and in its earliest uses it referred to roots of various kinds, first literal and then figurative.
Something radical, by definition, goes to the root of a system; identifies a problem; and then either destroys it and starts from scratch, overturns it greatly ...
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believing or expressing the belief that there should be great or extreme social or political change: He was known as a radical reformer/thinker/politician. ...
noun · a person who holds or follows strong convictions or extreme principles; extremist. · a person who advocates fundamental political, economic, and social ...
Characterized by independence of or departure from what is usual or traditional; progressive, unorthodox, or innovative in outlook, conception, design, etc.
In more everyday language, a radical is someone who has very extreme views, so you could say that their views are different from the root up.
1. basic, essential; original, innate, ingrained. 2. complete, unqualified, thorough; drastic, excessive, immoderate, violent.
RADICAL meaning: 1 : very new and different from what is traditional or ordinary; 2 : very basic and important.
relating to the most basic and important parts of something; complete and detailed. synonym far-reaching.