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English definition of “radical”

radical

adjective  /ˈræd·ɪ·kəl/ us  

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  /ˈræd·ɪ·kli/ us  
Her views are not radically different from my own.

radical

noun [C]  /ˈræd·ɪ·kəl/ us  

radical noun [C] (SUPPORTING CHANGE)

a person who supports great social, economic, or political change
(Definition of radical from the Cambridge Academic Content Dictionary © Cambridge University Press)
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