One who follows, believes or espouses relativism.

(physics) Of or relating to relativity. / (physics) At or near the speed of light. / (philosophy) Of or relating to relativism.

plural of relativist

In a relativistic way.

(physics) The increased mass of an object moving at relativistic speed relative to an observer.

(physics) The mechanics of objects moving at velocities comparable to the speed of light; is compatible with the special and general theories of relativity.

Alternative spelling of nonrelativistic

plural of relativistic mass