Ego is a Latin word meaning "I", which is derived from the Greek word "Εγώ (Ego)" meaning "I", often used to refer to the self.
In psychology, ego refers to 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.
In everyday language, ego can mean:
1. Self-esteem or self-importance
2. A person's sense of self-worth or self-respect
3. In slang, it can refer to someone who is arrogant or self-centered