from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun In psychoanalysis, the tendency or drive to achieve pleasure and avoid pain as the chief motivating force in behavior.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun (psychoanalysis) the governing principle of the id; the principle that an infant seeks gratification and fails to distinguish fantasy from reality
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