ego
US /ˈiː.ɡoʊ/
UK /ˈiː.ɡoʊ/
1.
a person's sense of self-esteem or self-importance
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His ego was bruised when he didn't get the promotion.
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She has a huge ego and always thinks she's right.
2.
(in Freudian theory) the part of the mind that mediates between the conscious and unconscious elements and is responsible for reality testing and a sense of personal identity
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According to Freud, the ego balances the id and the superego.
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The development of the ego is crucial for a healthy personality.