relativistic
adjective
rel·a·tiv·is·tic
ˌre-lə-ti-ˈvi-stik
1
: of, relating to, or characterized by relativity or relativism
2
: moving at a velocity such that there is a significant change in properties (such as mass) in accordance with the theory of relativity
a relativistic electron
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Merriam-Webster unabridged
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