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rapidity
Variant of rapid
adjective
moving, progressing, or occurring with speed; swift; fast; quick
noun
- a part of a river where the current is relatively swift, as because of a narrowing of the river bed
- a rapid transit car, train, or system
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
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