the concept of self, that gives the sense of individuality; the individual as self-aware; the ego.

constant, excessive reference to oneself in speaking or writing; an exaggerated opinion of oneself, one's merits, etc.; conceit; egotism.

(psych.) that part of the psyche which is regarded as the reservoir of the instinctual drives and the source of psychic energy, which is dominated by the pleasure principle and irrational wishing, and its impulses are controlled through the development of the ego and superego; id.