Definition of alter ego
- Clark Kent and his alter ego Superman
- a fictional character that is the author's alter ego
a trusted adviser who is the President's alter ego
over the years the state's other senator became his alter ego as well as his political ally
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In Latin, alter ego literally means "second I". An alter ego can be thought of as a person's clone or second self. A professional alter ego might be a trusted aide who knows exactly what the boss wants done. A personal alter ego might be a close friend who is almost like a twin. Alter ego can also refer to the second, hidden side of one's own self. In Robert Louis Stevenson's classic The Strange Case of Doctor Jekyll and Mr. Hyde, Dr. Jekyll is a good-hearted, honorable man; but after taking a potion, his alter ego, the loathsome and diabolical Mr. Hyde, takes over his personality.
: a different version of yourself
: a close friend who thinks or feels similarly to the way you think or feel
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