ego

ego (e´go) that segment of the personality dominated by the reality principle, comprising integrative and executive aspects functioning to adapt the forces and pressures of the id and superego and the requirements of external reality by conscious perception, thought, and learning.

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e·go (g, g)

n.

In psychoanalytic theory, the division of the psyche that is conscious, most immediately controls thought and behavior, and mediates between the person and external reality.