/ ˈiːgəʊ; ˈegəʊ; NAmE ˈiːgoʊ/ noun ( pl. -os )
1.
your sense of your own value and importance :
He has the biggest ego of anyone I've ever met.
Winning the prize really boosted her ego .
2.
( psychology ) the part of the mind that is responsible for your sense of who you are (= your identity)
—see also alter ego
—compare superego , id
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WORD ORIGIN
early 19th cent.: from Latin , literally I .