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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. 1  an accepted or professed rule of action or conduct: a person of good moral principles. 2  a fundamental, primary, or general law or truth from which others are derived: the principles of modern physics. 3  a fundamental doctrine or tenet; a distinctive ruling opinion: the principles of the Stoics.