What is the meaning of Rapidity?
speed, swiftness; the condition of being rapid
A measure of velocity relative to the speed of light; defined as artanh(v), where artanh is the hyperbolic arctangent, and v = speed (with c = speed of light = 1).
A measure of the velocity of a particle in a beam relative to the beam's axis
Source: wiktionary.org5 Letter Word Finder
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