adjective sometimes, rapider, rapidest.
occurring within a short time; happening speedily: rapid growth.
moving or acting with great speed; swift: a rapid worker.
characterized by speed: rapid motion.
Usually, rapids. a part of a river where the current runs very swiftly.

1625–35; < Latin rapidus tearing away, seizing, swift. See rape1, -id4

rapidly, adverb
ultrarapid, adjective
ultrarapidly, adverb

fast, quick, rapid, swift (see synonym study at quick).

2. See quick.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rapid (ˈræpɪd)
1.  (of an action or movement) performed or occurring during a short interval of time; quick: a rapid transformation
2.  characterized by high speed: rapid movement
3.  acting or moving quickly; fast: a rapid worker
[C17: from Latin rapidus tearing away, from rapere to seize; see rape1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1634, from L. rapidus "hasty, snatching," from rapere "hurry away, carry off, seize, plunder," from PIE base *rep- "to snatch" (cf. Gk. ereptomai "devour," harpazein "snatch away"). Rapids is 1765, from Fr. rapides, applied by Fr. voyagers to North American rivers. Rapid-transit first attested 1873;
rapid eye movement is from 1916.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Electrical cardioversion, the use of electric shock to restore a rapid
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The next step is to sort out what these genes do and which are responsible for
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Distinctive appearance, rapid growth, and easy culture are more add to my plant
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