(n.) The quality or state of being rapid; swiftness; celerity; velocity; as, the rapidity of a current; rapidity of speech; rapidity of growth or improvement.
Thesaurus Entries
air speed, alacrity, bat, briskness, ceaselessness, celerity, chattering, constancy, constant flow, continualness, continuity, decisiveness, dispatch, expedition, expeditiousness, fastness, flight, flit, flurry, gait, ground speed, haste, hurry, immediacy, immediateness, incessancy, instantaneousness, knots, lightning speed, miles per hour, noninterruption, oscillation, pace, perpetuity, precipitation, promptitude, promptness, pulsation, punctuality, punctualness, quick fire, quickness, rapid fire, rapid recurrence, rapid succession, readiness, regularity, repetition, round pace, rpm, rush, snappiness, speed, speediness, staccato, steadiness, stuttering, summariness, sustainment, swift rate, swiftness, tattoo, unintermission, uninterruption, velocity, vibration
