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alter ego

[awl-ter ee-goh, eg-oh, al-] /ˈɔl tər ˈi goʊ, ˌɛg oʊ, ˈæl-/
noun
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.
Origin
1530-1540
1530-40; < Latin (Cicero), probably translation of Greek állos egṓ, héteros egṓ another I
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for alter-ego

alter ego

/ˈæltər ˈiːɡəʊ; ˈɛɡəʊ/
noun
1.
a second self
2.
a very close and intimate friend
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
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Word Origin and History for alter-ego

alter ego

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

Online Etymology Dictionary, © 2010 Douglas Harper
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alter-ego in Medicine

alter ego al·ter ego (ôl'tər)
n.
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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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.”

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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