[[t]ˌrɛl ə təˈvɪs tɪk[/t]] adj.
1) pertaining to relativity or relativism
2) phs Physics.
a) subject to the special or the general theory of relativity
b) phs having a velocity that is close to the speed of light:
radiation from relativistic electrons[/ex]
Etymology: 1885–90 rel`a•tiv•is′ti•cal•ly, adv.

From formal English to slang. 2014.

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