alter ego

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

1530–40; < Latin (Cicero), probably translation of Greek állos egṓ, héteros egṓ another I Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alter ego (ˈæltər ˈiːɡəʊ, ˈɛɡəʊ)
1.  a second self
2.  a very close and intimate friend
[Latin: other self]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

alter ego
1530s, from L. phrase (used by Cicero), "a second self, a trusted friend" (cf. Gk. allos ego); see alter and ego.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

alter ego al·ter ego (ôl'tər)
Another side of oneself; a second self.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
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.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Eventually the doctor repents and tries to slough off his vile alter ego.
In these boom-and-crash years, the more reckless alter ego dominates.
Id say hes made a bet with another billionaire or his alter ego to see if its
  possible his ideas about reality are right.
On the wall, his cartoon alter ego poises itself at the top of the virtual
  incline, skis ready.
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