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

"radical" in British English

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radicaladjective

uk   /ˈræd.ɪ.kəl/ us   /ˈræd.ɪ.kəl/
  • radical adjective (SUPPORTING CHANGE)

C2 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. These people have very radical views.

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  • radical adjective (VERY IMPORTANT)

C1 relating to the most important parts of something or someone; complete or extreme: We need to make some radical changes to our operating procedures. I'm just having my hair trimmed - nothing radical.

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radically
adverb uk   /ˈræd.ɪ.kəl.i/ us   /ˈræd.ɪ.kəl.i/
C1 Barker introduced some radically new ideas.

radicalnoun [C]

uk   /ˈræd.ɪ.kəl/ us   /ˈræd.ɪ.kəl/
C2 a person who supports great social and political change: She was a radical all her life.
radicalism
noun [U] uk   /ˈræd.ɪ.kəl.ɪ.zəm/ us   /ˈræd.ɪ.kəl.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 extreme social, economic, or political change: White’s political orientation was decidedly liberal, but hardly radical.
  • radical adjective (EXTREME)

causing or being an example of great change; extreme: During bad economic times, 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)

(Definition of radical from the Cambridge Academic Content Dictionary © Cambridge University Press)
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