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| a sequence of changing states that produces a final state identical to the original one; one of a succession of periodically recurring events |
| the distance measured by the propagation of a wave between two successive points in the wave that are characterized by the same phase of oscillation |
| inertial system | |
| —n | |
| Also called: inertial reference frame a frame of reference within which bodies are not accelerated unless acted upon by external forces | |