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1. Oxford American Dictionary

   radical

   • IPA[ˈradək(ə)l]

   美式

   • adj.
     (especially of change or action) relating to or affecting the fundamental nature of something; far-reaching or thorough；forming an inherent or fundamental part of the nature of someone or something
   • n.
     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.；a group of atoms behaving as a unit in a number of compounds.

   • noun: radical, plural noun: radicals

2. • 釋義

   adj.

   形容詞

   • 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 同義詞 thoroughgoing, thorough, complete, total, entire, ... 更多absolute, utter, comprehensive, exhaustive, root-and-branch, sweeping, far-reaching, wide-ranging, extensive, profound, drastic, severe, serious, major, desperate, stringent, violent, forceful, rigorous, draconian反義詞 superficial
   • ▪ forming an inherent or fundamental part of the nature of someone or something the assumption of radical differences between the mental attributes of literate and nonliterate peoples 同義詞 fundamental, basic, essential, quintessential, inherent, ... 更多innate, structural, deep-seated, intrinsic, organic, constitutive, root反義詞 minor
   • ▪ (of surgery or medical treatment) thorough and intended to be completely curative.
   • 2. advocating or based on thorough or complete political or social change; representing or supporting an extreme or progressive section of a political party a radical activist 同義詞 revolutionary, progressive, reforming, reformist, progressivist, ... 更多revisionist, leftist, left-wing, socialist, anticapitalist, extremist, fanatical, militant, diehard, informalwoke, right-on, informal, derogatorycommie, Bolshevik, lefty, red, pink, bolshie反義詞 conservative, reactionary, moderate
   • ▪ characterized by independence of or departure from tradition; innovative or unorthodox the daring, avant-garde spirit of the music was too radical for the conservative audience
   • 3. denoting or relating to the roots of a word.
   • ▪ belonging to the root of a chord.
   • 4. of the root of a number or quantity.
   • 5. of, or springing direct from, the root or stem base of a plant.
   • 6. North American informal very good; excellent Okay, then. Seven o'clock. Radical!

   n.

   名詞

   • 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.
   • 2. a group of atoms behaving as a unit in a number of compounds.
   • 3. the root or base form of a word.
   • ▪ any of the basic set of 214 Chinese characters constituting semantically or functionally significant elements in the composition of other characters and used as a means of classifying characters in dictionaries.
   • 4. a quantity forming or expressed as the root of another.
   • ▪ a radical sign.