relativitist Definition

1. The condition of being relative to and therefore affected by something else.

Thesaurus: dependence, pertinency, relevancy, interdependence, comparability, proportionality, interconnection, contingency.
2. Two theories of motion, special theory of relativity (1905) and general theory of relativity (1915), developed by Albert Einstein, which recognize the dependence of space, time and other physical measurements on the position and motion of the observer who is making the measurements.

A person who studies or accepts relativity.