relativistically

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.

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 mechanicsa relativistic electron; a relativistic velocity
2. physics of, concerned with, or involving relativity
3. of or relating to relativism