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in principle with regard to theory, aside from practical application.
on principle according to one's principles.
Pauli exclusion principle the principle that no two electrons, protons, or the like in a particular system can occupy the same space at the same time.
Peter Principle the satiric idea that employees of large organizations tend to be promoted until they reach the level at which they are incompetent.
pleasure principle in psychoanalysis, the theory that humans tend to secure gratification and pleasure and to avoid pain or unpleasantness.
uncertainty principle in quantum mechanics, the principle that two related quantities cannot be measured simultaneously and exactly; indeterminacy principle.