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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.
1. 1  the principle of life, feeling, thought, and action in humans, regarded as a distinct entity separate from the body, and commonly held to be separable in existence from the body; the spiritual part of humans as distinct from the physical part.