relativistic

rel•a•tiv•is•tic adj.

of or pertaining to relativity or relativism.
Physics
- subject to the special or the general theory of relativity.
- Physics(of a velocity) having a magnitude that is a significant fraction of the speed of light.
- Physics(of a particle) having a relativistic velocity:radiation from relativistic electrons.

rel′a•tiv•is′ti•cal•ly, adv.

Collins Concise English Dictionary © HarperCollins Publishers::

relativistic /ˌrɛlətɪˈvɪstɪk/ adj

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
of, concerned with, or involving relativity
of or relating to relativism

ˌrelativˈistically adv

'relativistic' also found in these entries (note: many are not synonyms or translations):

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