rapid

[rap-id]
adjective sometimes, rapider, rapidest.
1.
occurring within a short time; happening speedily: rapid growth.
2.
moving or acting with great speed; swift: a rapid worker.
3.
characterized by speed: rapid motion.
noun
4.
Usually, rapids. a part of a river where the current runs very swiftly.

Origin:
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)
 
adj
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]
 
'rapidly
 
adv
 
rapidity
 
n
 
'rapidness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

rapid
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
As a result, they can manage their resources with agility, and quickly respond to the demands of a rapidly changing global market.
We have a hardworking research staff that keeps careful track of a rapidly
  changing world in many ways.
Conservation of angular momentum explains why an ice skater spins more rapidly
  as she pulls her arms in.
Flat basal rosette spreads rapidly by underground runners.
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