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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.
principle - (law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature); the rationale for capital punishment; the principles of internal-combustion engines