Definition of triad noun from the Oxford Advanced American Dictionary

     

    triad

     noun
    noun
    NAmE//ˈtraɪæd//
     
     
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  1. 1(formal) a group of three related people or things the classic triad of the visual arts: sculpture, architecture, and painting
  2. 2 Triad a Chinese secret organization involved in criminal activity
See the Oxford Advanced Learner's Dictionary entry: triad