radical Meaning in the Cambridge English Dictionary
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Meaning of “radical” in the English Dictionary

"radical" in British English

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radicaladjective

uk   us   /ˈræd.ɪ.kəl/

radical adjective (SUPPORTING CHANGE)

C2 believing or ​expressing the ​belief that there should be ​great or ​extremesocial or ​politicalchange: He was ​known as a radical ​reformer/​thinker/​politician. These ​people have very radical ​views.
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radical adjective (VERY IMPORTANT)

C1 relating to the most ​importantparts of something or someone; ​complete or ​extreme: We need to make some radical changes to ​ouroperatingprocedures. I'm just having my ​hairtrimmed - nothing radical.
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radical adjective (SURGERY)

specialized medical aimed at ​removing all ​diseasedtissue: Cervical ​cancer may be ​cured with radical ​surgery when it is ​confined to the ​pelvis or ​regionallymphnodes.
radically
adverb uk   us   /-i/
C1 Barker ​introduced some radically new ​ideas.

radicalnoun [C]

uk   us   /ˈræd.ɪ.kəl/
C2 a ​person who ​supportsgreatsocial and ​politicalchange: She was a radical all her ​life.
radicalism
noun [U] uk   us   /-ɪ.zəm/
(Definition of radical from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"radical" in American English

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radicaladjective

 us   /ˈræd·ɪ·kəl/

radical adjective (SUPPORTING CHANGE)

believing or ​expressing the ​belief that there should be ​great or ​extremesocial, ​economic, or ​politicalchange: White’s ​politicalorientation was ​decidedlyliberal, but ​hardly radical.

radical adjective (EXTREME)

causing or being an ​example of ​greatchange; ​extreme: During ​badeconomictimes, radical ​steps may be ​necessary to ​restore the ​confidence of the ​consumer.
radically
adverb  us   /ˈræd·ɪ·kli/
Her ​views are not radically different from my own.

radicalnoun [C]

 us   /ˈræd·ɪ·kəl/

radical noun [C] (SUPPORTING CHANGE)

a ​person who ​supportsgreatsocial, ​economic, or ​politicalchange
(Definition of radical from the Cambridge Academic Content Dictionary © Cambridge University Press)
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