Definition of rapid
(Entry 1 of 2)
: marked by a fast rate of motion, activity, succession, or occurrence
rapid
nounDefinition of rapid (Entry 2 of 2)
: a part of a river where the current is fast and the surface is usually broken by obstructions
—usually used in plural but singular or plural in construction
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Merriam-Webster unabridged
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Time Traveler for rapid
The first known use of rapid was in 1634
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