I. | ̷ ̷ ̷ ̷ ̷ ̷|vistik adjective
1. : of, relating to, or characterized by relativity or relativism ; specifically : tending to regard human nature and values as subject to changing sociocultural conditions rather than as absolute or universal
2. : of or relating to the physical theory of relativity
• rel·a·tiv·is·ti·cal·ly -stə̇k(ə)lē adverb
II. adjective
1. : moving at or being a velocity that is a significant fraction of the speed of light such that effects (as change in mass) predicted by the theory of relativity become evident
a relativistic electron
2. : of or relating to a relativistic particle