ego

US [ˈiɡoʊ]
UK [ˈiːɡəʊ]
Plural Form:egos  
ego-
n.
1.
自我价值感your sense of your own value and importance
He has the biggest ego of anyone I've ever met.
他是我见过的最自负的人。
Winning the prize really boosted her ego .
获得这个奖项大大增强了她的自尊心。
2.
自我the part of the mind that is responsible for your sense of who you are (= your identity)