Definition of initiation noun from the Oxford Advanced American Dictionary

      

    initiation

     noun
    noun
    NAmE//ɪˌnɪʃiˈeɪʃn//
     
    [uncountable]
     
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  1. 1the act of someone becoming a member of a group, often with a special ceremony; the act of introducing someone to an activity or skill an initiation ceremony initiation into something her initiation into the world of marketing
  2. 2(formal) the act of starting something the initiation of criminal proceedings
See the Oxford Advanced Learner's Dictionary entry: initiation