#Einstein's_theory_of_relativity__relativity__theory_of_relativity__relativity_theory  (physics) the theory that space and time are relative concepts rather than absolute concepts
  supertype:  #scientific_theory  a theory that explains scientific observations; "scientific theories must be falsifiable"
  part of:  #physics
  subtype:  #general_relativity_theory__general_relativity__generalrelativity__general_theory_of_relativity__Einstein's_general_theory_of_relativity  a generalization of special relativity to include gravity (based on the principle of equivalence)
  subtype:  #special_relativity_theory__special_relativity__specialrelativity__special_theory_of_relativity__Einstein's_special_theory_of_relativity  a physical theory of relativity based on the assumption that the speed of light in a vacuum is a constant and the assumption that the laws of physics are invariant in all inertial systems

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