Ego (noun)
The self, especially with a sense of self-importance.
Ego (noun)
The most central part of the mind, which mediates with one’s surroundings.
Superego (noun)
The part of the mind that acts as a self-critical conscience, reflecting social standards that have been learnt.
Wiktionary
Ego (noun)
a person’s sense of self-esteem or self-importance
“he needed a boost to his ego”
Ego (noun)
the part of the mind that mediates between the conscious and the unconscious and is responsible for reality testing and a sense of personal identity.
Ego (noun)
(in metaphysics) a conscious thinking subject.
Oxford Dictionary