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relativistic

[rel-uh-tuh-vis-tik] /ˌrɛl ə təˈvɪs tɪk/
adjective
1.
of or relating to relativity or relativism.
2.
Physics.
  1. subject to the special or the general theory of relativity.
  2. (of a velocity) having a magnitude that is a significant fraction of the speed of light.
  3. (of a particle) having a relativistic velocity:
    radiation from relativistic electrons.
Origin
1885-1890
1885-90; relativist + -ic
Related forms
relativistically, adverb
ultrarelativistic, adjective
unrelativistic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ultra-relativistic

relativistic

/ˌrɛlətɪˈvɪstɪk/
adjective
1.
(physics) having or involving a speed close to that of light so that the behaviour is described by the theory of relativity rather than by Newtonian mechanics: a relativistic electron, a relativistic velocity
2.
(physics) of, concerned with, or involving relativity
3.
of or relating to relativism
Derived Forms
relativistically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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