GNU Collaborative International Dictionary of English

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Found one definition 

  1.       
Relativistic (?), a.
    1. of, pertaining to, or in conformity with the theory of relativity; as, “the relativistic increase of mass with velocity”.

    [PJC]


    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”.br/
    [PJC]

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