[{"Bold_text": "adjective", "List Items": ["of or relating to relativity or relativism.", "Physics.subject to the special or the general theory of relativity general theory of relativity.(of a velocity) having a magnitude that is a significant fraction of the speed of light speed of light.(of a particle) having a relativistic velocity:radiation from relativistic electrons.", "subject to the special or the general theory of relativity general theory of relativity.", "(of a velocity) having a magnitude that is a significant fraction of the speed of light speed of light.", "(of a particle) having a relativistic velocity:radiation from relativistic electrons."]}]