Rapidity

Ra·pid'i·ty (rȧ*pĭd'ĭ*tȳ) noun [ Latin rapiditas : confer French rapidité .] The quality or state of being rapid; swiftness; celerity; velocity; as, the rapidity of a current; rapidity of speech; rapidity of growth or improvement. Sy
Found on http://www.encyclo.co.uk/webster/R/11

Rapidity

• (n.) The quality or state of being rapid; swiftness; celerity; velocity; as, the rapidity of a current; rapidity of speech; rapidity of growth or improvement.
Found on http://thinkexist.com/dictionary/meaning/rapidity/

rapidity

rapidity A rapid state or quality; speediness; celerity.
Found on http://www.wordinfo.info/words/index/info/view_unit/1830/

Rapidity

In relativity, rapidity is an alternative to speed as a measure of motion. On parallel velocities (say, in one-dimensional space) rapidities are simply additive, unlike speeds at relativistic velocities. For low speeds, rapidity and speed are proportional, but for high speeds, rapidity takes a larger value. The rapidity of light is infinite. Using
Found on http://en.wikipedia.org/wiki/Rapidity
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