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rapidity

Pronunciation: /ɹəˈpɪd.ɪ.ti/

The English word “rapidity” has 3 meanings listed here.

noun

  1. speed, swiftness; the condition of being rapid
  2. 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).
  3. A measure of the velocity of a particle in a beam relative to the beam's axis

Etymology

From rapid + -ity, from French rapidité, from Latin rapiditas.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.