Einstein's principle of relativity

Einstein's principle of relativity

[′īn‚stīnz ¦prin·sə·pəl əv rel·ə′tiv·əd·ē]
(relativity)
The principle that all the laws of physics must assume the same mathematical form in any inertial frame of reference; thus, it is impossible to determine the absolute motion of a system by any means.
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