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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.
Not to be confused with Principal. For other uses, see Principle (disambiguation). A principle is a law or rule that has to be, or usually is to be followed, or can be desirably followed, or is an inevitable consequence of something, such as the laws observed in nature or the way that a system is constructed.