1. exclusion principle no two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers
  2. Pauli exclusion principle no two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers
  3. localisation principle (physiology) the principle that specific functions have relatively circumscribed locations in some particular part or organ of the body
  4. localization principle (physiology) the principle that specific functions have relatively circumscribed locations in some particular part or organ of the body
  5. mass-action principle (neurology) the principle that the cortex of the brain operates as a coordinated system with large masses of neural tissue involved in all complex functioning
  6. exclusionary rule a rule that provides that otherwise admissible evidence cannot be used in a criminal trial if it was the result of illegal police conduct
  7. accounting principle a principle that governs current accounting practice and that is used as a reference to determine the appropriate treatment of complex transactions
  8. uncertainty principle (quantum theory) the theory that it is impossible to measure both energy and time (or position and momentum) completely accurately at the same time
  9. in principle with regard to fundamentals although not concerning details
  10. Le Chatelier principle the principle that if any change is imposed on a system that is in equilibrium then the system tends to adjust to a new equilibrium counteracting the change
  11. judicial principle a principle underlying the formulation of jurisprudence
  12. pleasure principle the governing principle of the id
  13. legal principle a principle underlying the formulation of jurisprudence
  14. superposition principle (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest
  15. Le Chatelier's principle the principle that if any change is imposed on a system that is in equilibrium then the system tends to adjust to a new equilibrium counteracting the change
  16. Archimedes' principle (hydrostatics) the apparent loss in weight of a body immersed in a fluid is equal to the weight of the displaced fluid
  17. pleasure-pain principle the governing principle of the id
  18. reality principle the governing principle of the ego
  19. school principal the educator who has executive authority for a school
  20. basic principle principles from which other truths can be derived

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