Alter ego
Latin phrase; alternate self / From Wikipedia, the free encyclopedia
This article is about the Latin term. For The German term, see Doppelgänger.
An alter ego (from Latin, "other I") is another self — a second personality within a person. It is also called leading a double life. The term "alter ego" was first used in the 19th century. It was inventory by psychologists in talking about dissociative identity disorder.
For example, in The Strange Case of Dr Jekyll and Mr Hyde, Mr. Hyde was Dr. Jekyll's evil alter ego (same person, different personalities).