Definition of trinity noun from the Oxford Advanced Learner's Dictionary

     

    trinity

     noun
    noun
    BrE BrE//ˈtrɪnəti//
     
    ; NAmE NAmE//ˈtrɪnəti//
     
    [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
  3. Word Origin Middle English: from Old French trinite, from Latin trinitas ‘triad’, from trinus ‘threefold’, from tres ‘three’.
See the Oxford Advanced American Dictionary entry: trinity