Definition of trinity noun from the Oxford Advanced American Dictionary

     

    trinity

     noun
    noun
    NAmE//ˈtrɪnət̮i//
     
    [singular]
     
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  1. 1 the Trinity (in Christianity) the union of Father, Son, and Holy Spirit as one God
  2. 2(formal) a group of three people or things
See the Oxford Advanced Learner's Dictionary entry: trinity