rel·a·tiv·is·tic adjective \ˌre-lə-ti-ˈvis-tik\
: moving at a velocity such that there is a significant change in properties (as mass) in accordance with the theory of relativity <a relativistic electron>
— rel·a·tiv·is·ti·cal·ly \-ˈvis-ti-k(ə-)lē\ adverb
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