American English

Definition of radical adjective from the Oxford Advanced American Dictionary

      

    radical

     adjective
    adjective
    NAmE//ˈrædɪkl//
     
    [usually before noun]
     
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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. 2 new, different, and likely to have a great effect radical ideas a radical solution to the problem radical proposals
  3. 3in favor of thorough and complete political or social change the radical wing of the party radical politicians/students/writers
  4. 4 (old-fashioned) (slang) very good
  5. NAmE//ˈrædɪkli//
     
    adverb The new methods are radically different from the old. Attitudes have changed radically.
See the Oxford Advanced Learner's Dictionary entry: radical