noun
principle of relativity
Physics term referring to the fundamental postulate that the laws of physics are the same in all inertial frames.
アインシュタインの相対性原理は、物理学の基礎となっている。
Einstein's principle of relativity forms the foundation of physics.
相対性理論 is the theory of relativity, while 相対性原理 refers specifically to the principle itself.
Compound of 相対性 (relativity) and 原理 (principle). The term is a direct translation of the English 'principle of relativity'.