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principle of operation definition, principle of operation meaning | English dictionary. principle. n (Psychoanal) the idea that psychological processes and actions are governed by the gratification of needs. n the. the principle that energy and time or position and momentum, cannot both be accurately measured simultaneously.
part of the personality that develops out of a need to deal with reality, mostly conscious, rational, and logical. -reality principle. reality principle. principle by which the ego functions; the need for the satisfaction of the demands of the id only when negative consequences will not result.