radical Meaning in Cambridge American English Dictionary
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Meaning of "radical" - American English Dictionary

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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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