RAPIDITY

celerity, quickness, rapidity, rapidness, speediness

(noun) a rate that is rapid

Source: WordNet® 3.1

Etymology

Noun

rapidity (countable and uncountable, plural 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

Source: Wiktionary

Ra*pid"i*ty, n. Etym: [L. rapiditas: cf. F. rapidité.]

Definition: The quality or state of being rapid; swiftness; celerity; velocity; as, the rapidity of growth or improvement.

Syn.

– -- Rapidness; haste; speed; celerity; velocity; swiftness; fleetness; quickness; agility.

Source: Webster’s Unabridged Dictionary 1913 Edition

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