Definition of radical adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈrædɪkl//
    ; NAmE NAmE//ˈrædɪkl//
    [usually before noun] Terrorism
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  1. 1concerning the most basic and important parts of something; thorough and complete synonym far-reaching the need for radical changes in education demands for radical reform of the law radical differences between the sexes
  2. 2new, different and likely to have a great effect radical ideas a radical solution to the problem radical proposals
  3. 3 in favour of thorough and complete political or social change the radical wing of the party radical politicians/students/writers Wordfindercapitalism, communism, democracy, dictatorship, fascism, imperialism, liberal, radical, socialism, system See related entries: Terrorism
  4. 4(old-fashioned, North American English, slang) very good
  5. Word Originlate Middle English (in the senses ‘forming the root’ and ‘inherent’): from late Latin radicalis, from Latin radix, radic- ‘root’.Extra examples a truly radical concept He proposed a radical solution to the problem. He spoke of the need for radical changes in education. There have been demands for radical reform of the law. This document marks a radical departure from earlier recommendations. radical politicians/​students/​writers
See the Oxford Advanced American Dictionary entry: radical