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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, rule(noun) a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct. their principles of composition characterized all their works. principle(noun) a rule or standard especially of good behavior. a man of principle; he will not violate his principles.