#principle.law_of_nature__rule  a rule or law concerning a natural phenomenon or the function of a complex system: "the principle of the conservation of mass"; "the principle of jet propulsion"; "the right-hand rule for inductive fields"
  supertype:  law_of_nature__law  a generalization that describes recurring facts or events in nature: "the laws of thermodynamics"
  subtype:  Le_Chatelier's_principle__Le_Chatelier's_law__Le_Chatelier_principle__Le_Chatelier-Braun_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
  subtype:  Gresham's_Law  (economics) the principle that when two kinds of money having the same denominational value are in circulation the intrinsically more valuable money will be hoarded and the money of lower intrinsic value will circulate more freely until the intrinsically more valuable money is driven out of circulation; bad money drives out good; credited to Sir Thomas Gresham
  subtype:  Naegele's_rule  rule for calculating an expected delivery date; subtract three months from the first day of the last menstrual period and add seven days to that date
  subtype:  Occam's_Razor__Ockham's_Razor__principle_of_parsimony__law_of_parsimony  the principle that entities should not be multiplied needlessly; the simplest of two competing theories is to be preferred
  subtype:  principle_of_equivalence  (physics) the principle that an observer has no way of distinguishing whether his laboratory is in a uniform gravitational field or is in an accelerated frame of reference
  subtype:  principle_of_liquid_displacement  (hydrostatics) the volume of a body immersed in a fluid is equal to the volume of the displaced fluid
  subtype:  Huygens'_principle_of_superposition__principle_of_superposition  the displacement of any point due to the superposition of wave systems is equal to the sum of the displacements of the individual waves at that point; "the principle of superposition is the basis of the wave theory of light"
  subtype:  mass-action_principle__mass_action  (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
  subtype:  localization_of_function__localisation_of_function__localization_principle__localisation_principle__localization__localisation  (neurology) the principle that specific functions have relatively circumscribed locations in the cortex of the brain
     subtype:  lateralization__lateralisation__laterality  localization of function on either the right or left sides of the brain

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