ego

[ee-goh, eg-oh]
noun, plural egos.
1.
the “I” or self of any person; a person as thinking, feeling, and willing, and distinguishing itself from the selves of others and from objects of its thought.
2.
Psychoanalysis. the part of the psychic apparatus that experiences and reacts to the outside world and thus mediates between the primitive drives of the id and the demands of the social and physical environment.
3.
egotism; conceit; self-importance: Her ego becomes more unbearable each day.
4.
self-esteem or self-image; feelings: Your criticism wounded his ego.
5.
(often initial capital letter) Philosophy.
a.
the enduring and conscious element that knows experience.
b.
Scholasticism. the complete person comprising both body and soul.
6.
Ethnology. a person who serves as the central reference point in the study of organizational and kinship relationships.

Origin:
1780–90; < Latin: I; psychoanalytic term is translation of German (das) Ich (the) I

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World English Dictionary
ego (ˈiːɡəʊ, ˈɛɡəʊ)
 
n , pl egos
1.  the self of an individual person; the conscious subject
2.  psychoanal the conscious mind, based on perception of the environment from birth onwards: responsible for modifying the antisocial instincts of the id and itself modified by the conscience (superego)
3.  one's image of oneself; morale: to boost one's ego
4.  egotism; conceit
 
[C19: from Latin: I]

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Etymonline
Word Origin & History

ego
1714, as a term in metaphysics, from L. ego "I" (cognate with O.E. ic, see I). Psychoanalytic sense is 1910; sense of "conceit" is 1891. Ego trip first recorded 1969.
"In the book of Egoism it is written, Possession without obligation to the object possessed approaches felicity." [George Meredith, "The Egoist" (1879)]
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ego e·go (ē'gō, ěg'ō)
n.
In psychoanalytic theory, the division of the psyche that is conscious, most immediately controls thought and behavior, and mediates between the person and external reality.

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
ego [(ee-goh)]

The “I” or self of any person (ego is Latin for “I”). In psychological terms, the ego is the part of the psyche that experiences the outside world and reacts to it, coming between the primitive drives of the id and the demands of the social environment, represented by the superego.

Note: The term ego is often used to mean personal pride and self-absorption: “Losing at chess doesn't do much for my ego.”
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
West admits that his ego has reached giant proportions.
Avoid having your ego so close to your position that when your position falls,
  your ego goes with it.
He is a small man with a big ego.
He is large of ego, full of money and cranky in mien.
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