Definition of alter ego noun from the Oxford Advanced Learner's Dictionary


    alter ego

    BrE BrE//ˌæltər ˈiːɡəʊ//
    ; NAmE NAmE//ˌæltər ˈiːɡoʊ//
    ; BrE BrE//ˌɔːltər ˈiːɡəʊ//
    ; NAmE NAmE//ˌɔːltər ˈiːɡoʊ//
    (pl. alter egos) (from Latin)
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  1. 1a person whose personality is different from your own but who shows or acts as another side of your personality Superman's alter ego was Clark Kent.
  2. 2a close friend who is very like yourself
  3. Word Originmid 16th cent.: Latin, ‘other self’.
See the Oxford Advanced American Dictionary entry: alter ego