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English definition of “ego”

ego

noun [C] uk   /ˈiː.ɡəʊ/ us    /ˈiː.ɡoʊ/ (plural egos)
your idea or opinion of yourself, especially your feeling of your own importance and ability: That man has such an enormous ego - I've never known anyone so full of themselves! I'm glad she got the job - she needed something to boost/bolster her ego (= give her confidence).Mind and personalityScience of psychology and psychoanalysisConfidence and self-assuranceShowing arrogance and conceitSaddening, shocking and upsetting specialized psychology in psychoanalysis, the part of a person's mind that tries to match the hidden desires (= wishes) of the id (= part of the unconscious mind) with the demands of the real world Science of psychology and psychoanalysisMind and personalityMind and personalityScience of psychology and psychoanalysis
(Definition of ego from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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