Meaning

noun an inflated feeling of pride in your superiority to others

noun your consciousness of your own identity

noun (psychoanalysis) the conscious mind

originFrom Latin ego (“I”). Chosen by Freud’s translator as a translation of his use of German Ich as a noun for this concept from the pronoun ich (“I”). Doublet of I and Ich.

Etymology from Wiktionary, CC BY-SA 3.0