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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.
Definition of principle for English Language Learners. : 1  a moral rule or belief that helps you know what is right and wrong and that influences your actions. : 2  a basic truth or theory : an idea that forms the basis of something. : 3  a law or fact of nature that explains how something works or why something happens.