Alter ego

//ˈɔːl.təɹ iːɡəʊ// noun

Definitions

Noun
  1. 1
    An individual's alternate personality or persona; another self.

    "Clark Kent's coworkers finally discovered his alter ego, Superman."

  2. 2
    a very close and trusted friend who seems almost a part of yourself wordnet
  3. 3
    A very close and intimate friend.

    "GWM, 5'10", 175, 40, non-smoker, MCC-er. Good build. Int. in classical music, books, travel. Seeks alter ego with own peace for honest relationship."

  4. 4
    A corporation used by a person to conduct personal business in an attempt to shield himself or herself from personal liability, and which a court may penetrate by "piercing the corporate veil" to impose liability on the person when they commit fraud or injustice.

Etymology

From Latin alter ego (literally “other me”).

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