1. 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
  2. general theory of relativity a generalization of special relativity to include gravity
  3. special 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
  4. theory of relativity (physics) the theory that space and time are relative concepts rather than absolute concepts
  5. Einstein's theory of relativity (physics) the theory that space and time are relative concepts rather than absolute concepts
  6. 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
  7. Einstein's general theory of relativity a generalization of special relativity to include gravity
  8. special verdict a verdict rendered on certain specific factual issues posed by the court without finding for one party or the other
  9. principle of relativity (physics) a universal law that states that the laws of mechanics are not affected by a uniform rectilinear motion of the system of coordinates to which they are referred
  10. special delivery mail that is delivered by a special carrier
  11. Special Air Service a specialist regiment of the British army that is trained in commando techniques of warfare and used in clandestine operations (especially against terrorist groups)
  12. special relativity theory 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
  13. special drawing rights reserve assets in the International Monetary Fund
  14. general relativity a generalization of special relativity to include gravity
  15. blood relative one related by blood or origin
  16. peripheral device (computer science) electronic equipment connected by cable to the CPU of a computer
  17. partial derivative the derivative of a function of two or more variables with respect to a single variable while the other variables are considered to be constant
  18. superlative highest in quality
  19. specific gravity the density of a substance relative to the density of water
  20. electronegativity (chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond