• synonyms

alter ego

[awl-ter ee-goh, eg-oh, al-]
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  1. a second self; a perfect substitute or deputy: His adviser acts as his alter ego during his absence.
  2. an inseparable friend.
  3. another aspect of one's self.
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Origin of alter ego

1530–40; < Latin (Cicero), probably translation of Greek állos egṓ, héteros egṓ another I
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for alter ego

alter ego

  1. a second self
  2. a very close and intimate friend
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Word Origin

Latin: other self
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for alter ego

1530s, from Latin phrase (used by Cicero), "a second self, a trusted friend" (cf. Greek allos ego); see alter and ego.

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Online Etymology Dictionary, © 2010 Douglas Harper

alter ego in Medicine

alter ego

  1. Another side of oneself; a second self.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

alter ego in Culture

alter ego

[(awl-tuhr ee-goh)]

An intimate friend, considered another side of oneself: “He was my alter ego; we were always picking up each other's thoughts.” Alter ego is Latin for “another I.”

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.