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Rapidity vs Rapidly - What's the difference?

rapidity | rapidly |

As a noun rapidity

is speed, swiftness; the condition of being rapid.

As an adverb rapidly is

with speed; in a rapid manner.

rapidity

English

Noun

(wikipedia rapidity) (rapidities)
  • speed, swiftness; the condition of being rapid
  • (physics) A measure of velocity relative to the speed of light
  • (physics) A measure of the velocity of a particle in a beam relative to the beam#s axis

    • Derived terms

    * midrapidity * pseudorapidity

    rapidly

    English

    Adverb

    (en adverb)
  • With speed; in a rapid manner.
  • *
    • , title=(The Celebrity), chapter=5 , passage=We expressed our readiness, and in ten minutes were in the station wagon, rolling rapidly down the long drive, for it was then after nine. We passed on the way the van of the guests from Asquith.}}
  • *{{quote-magazine, date=2013-07-20, volume=408, issue=8845, magazine=(The Economist)
    • , title= The attack of the MOOCs , passage=Since the launch early last year of […] two Silicon Valley start-ups offering free education through MOOCs, massive open online courses, the ivory towers of academia have been shaken to their foundations. University brands built in some cases over centuries have been forced to contemplate the possibility that information technology will rapidly make their existing business model obsolete.}}

    Synonyms

    * (with speed) quickly, speedily * See also