ID:

1. More often: id , in Freudian psychoanalytic theory, the part of the psyche (personality) that is the unconscious source of primitive sexual and aggressive drives; the life instinct; instinctive biological drives, such as the need for sex , food, and water.
ETYMOLOGY: From Latin id, it .

2. The penis . See penis for synonyms.

3. An identity card or evidence of one's identity. (In this case ID is pronounced as separate letters.)

See Also: ID

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