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Definition of anti- prefix from the Oxford Advanced American Dictionary

      

    anti-

     prefix
    prefix
    NAmE//ˈænti//
     
    , NAmE//ˈæntaɪ//
     
    , NAmE//ˈæntɪ//
     
    (in nouns and adjectives)
     
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  1. 1opposed to; against antitank weapons antisocial compare pro-
  2. 2the opposite of antihero anticlimax
  3. 3preventing antifreeze
See anti- in the Oxford Advanced Learner's Dictionary