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

Synonyms:

mental quickness, fast, adeptness, quick-wittedness, rapidness, deftness, hustle, facility, expeditiousness, dispatch, expedition, adroitness

hurriedness, impatience, abruptness, bustle, flurry, briskness, haste, fleetness, fastness, speediness, feverishness, swiftness, urgency, quickness

hurry, alacrity, rush, impetus, pace, speed, celerity, gallop, velocity

Usage examples:

• The main traveller began to creep toward the towers with relative rapidity. - "Out of the Primitive", Robert Ames Bennet.
• None realized the rapidity of its advance. - "Barriers Burned Away", E. P. Roe.
• Both quantity of goods and quantity of money are commonly defined as actual quantity multiplied by " rapidity of circulation." - "The Value of Money", Benjamin M. Anderson, Jr..