RELATIVISTIC

relativistic

(adjective) relating or subject to the special or the general theory of relativity; “relativistic quantum mechanics”; “relativistic increase in mass”; “radiation from relativistic particles”

relativistic

(adjective) of or relating to the philosophical doctrine of relativism

Source: WordNet® 3.1

Etymology

Adjective

relativistic (comparative more relativistic, superlative most relativistic)

(physics) Of or relating to relativity.

(physics) At or near the speed of light.

(philosophy) Of or relating to relativism.

Source: Wiktionary