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Adjective: relativistic  ,re-lu-ti'vis-tik
  1. (physics) relating or subject to the special or the general theory of relativity
    "relativistic quantum mechanics"; "relativistic increase in mass"; "radiation from relativistic particles"
     
  2. (physics) moving at close to the speed of light
     
  3. Of or relating to the philosophical doctrine of relativism

Encyclopedia: Relativistic