01 a. of, pertaining to, or in conformity with the theory of relativity; as, the relativistic increase of mass with velocity.
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1.
of, pertaining to, or in conformity with the theory of relativity; as, the relativistic increase of mass with velocity. See: theory of relativity
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2.
moving at a speed sufficiently high that the changes of mass or time dilation predicted by the theory of relativity may be observed; moving at a significant fraction of the speed of light; as, relativistic electrons.