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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.
A fixed or predetermined policy or mode of action. 4. A basic or essential quality or element determining intrinsic nature or characteristic behavior: the principle of self-preservation. 5. A rule or law concerning the functioning of natural phenomena or mechanical processes: the principle of jet propulsion. 6.