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English definition of “radical”

radical

adjective (SUPPORTING CHANGE)    /ˈræd.ɪ.kəl/
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.Politics radically     /-i/ adverb C1 Barker introduced some radically new ideas.Very important or urgent
(Definition of radical adjective (SUPPORTING CHANGE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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