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|Noun||1.||pleasure-pain principle - (psychoanalysis) the governing principle of the id; the principle that an infant seeks gratification and fails to distinguish fantasy from reality|
depth psychology, psychoanalysis, analysis - a set of techniques for exploring underlying motives and a method of treating various mental disorders; based on the theories of Sigmund Freud; "his physician recommended psychoanalysis"
principle - a basic truth or law or assumption; "the principles of democracy"