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Wikipedia definition
1. Alter egoAn alter ego (Latin, "the other I") is a second self, which is believed to be distinct from a person's normal or original personality. The term was coined in the early nineteenth century when dissociative identity disorder was first described by psychologists. A person who has an alter ego is said to lead a double life.
Read “Alter ego” on English Wikipedia
Read “オルター・エゴ” on Japanese Wikipedia
Read “Alter ego” on DBpedia

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