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[ruh-pid-i-tee] /rəˈpɪd ɪ ti/
a rapid state or quality; quickness; celerity.
Also, rapidness
[rap-id-nis] /ˈræp ɪd nɪs/ (Show IPA)
Origin of rapidity
1610-20; < Latin rapiditās. See rapid, -ity
swiftness, fleetness. See speed. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for rapidity
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Historical Examples
  • The pitch of a musical note depends upon the rapidity of its vibrations, or, in other words, on the length of its waves.

  • All these thoughts came to her with rapidity, as Crane talked with masterly judgment.

    Thoroughbreds W. A. Fraser
  • The rapidity of nitrification also depends on the degree of alkalinity of the solution.

  • To Linda it was almost a miracle, the rapidity with which a house could be erected in California.

    Her Father's Daughter Gene Stratton-Porter
  • And Pinocchio swam quicker than ever, and flew on with the rapidity of a ball from a gun.

    Pinocchio C. Collodi
  • Hence he moved with rapidity and precision, and was never taken by surprise.

  • The following anecdote will give some idea of the rapidity with which they work.

  • Do you agree with me that the letter rho is expressive of rapidity, motion, and hardness?

    Cratylus Plato
  • With a sudden spring, however, which made me start by its rapidity and force, the boa threw itself on its prey.

Word Origin and History for rapidity

1650s, from French rapidité and directly from Latin rapiditatem (nominative rapiditas) "swiftness, rapidity, velocity," from rapidus "hasty, swift, rapid" (see rapid).

Online Etymology Dictionary, © 2010 Douglas Harper
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