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adj. rap·id·er, rap·id·est
Moving, acting, or occurring with great speed. See Synonyms at fast1.
n. often rapids
An extremely fast-moving part of a river, caused by a steep descent in the riverbed.

[Latin rapidus, from rapere, to seize; see rep- in Indo-European roots.]

ra·pid′i·ty (rə-pĭd′ĭ-tē), rap′id·ness (răp′ĭd-nĕs) n.
rap′id·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(rəˈpɪd ɪ ti)

also rap•id•ness

(ˈræp ɪd nɪs)

a rapid state or quality; swiftness.
[1610–20; < Latin rapiditās. See rapid, -ity]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.rapidity - a rate that is rapid
pace, rate - the relative speed of progress or change; "he lived at a fast pace"; "he works at a great rate"; "the pace of events accelerated"
fleetness - rapidity of movement; "fleetness of foot"
immediateness, instancy, instantaneousness, immediacy - the quickness of action or occurrence; "the immediacy of their response"; "the instancy of modern communication"
expeditiousness, despatch, dispatch, expedition - the property of being prompt and efficient; "it was done with dispatch"
promptitude, promptness - the characteristic of doing things without delay
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002


The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
hraîi, snarleiki


[rəˈpɪdɪtɪ] Nrapidez f
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


[rəˈpɪdɪti] nrapidité f
Collins English/French Electronic Resource. © HarperCollins Publishers 2005


nSchnelligkeit f; (of action, movement also)Raschheit f; (of improvement, change, spread also)Rapidheit f; (of decline, rise)Steilheit f
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


[rəˈpɪdɪtɪ] nrapidità
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995


(ˈrӕpid) adjective
quick; fast. He made some rapid calculations; He looked feverish and had a rapid pulse.
ˈrapidly adverb
raˈpidity noun
ˈrapidness noun
ˈrapids noun plural
a place in a river where the water flows quickly, often having dangerous rocks in mid-stream.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.


n. rapidez, velocidad.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
The rotational velocity can be obtained as a function of the speed of light, the Lorentz factor, and the helical g-factor:
He also claimed that variations in the line-of-sight velocity should affect the observed luminosity proportionally to the Lorentz factor of the jet's expansion, [GAMMA] = [[1 - [(V/c).sup.2]].sup.-1/2] (where V is the relative velocity between the inertial reference frames and c is the speed of light), while the apparent [[tau].sub.lag] is proportional to 1/[GAMMA].
Let A be the Lorentz transformation which relates the reference frame where the unstable moving particle is at rest, to the one with velocity v = p/(m[[gamma].sub.L]), where [[gamma].sub.L] is the corresponding relativistic Lorentz factor. Let U(A) be an unitary representation of the transformation A acting on the Hilbert space H such that |m, p> = U([LAMBDA])|m, 0> for every value of the mass parameter m in the Hamiltonian spectrum.
The inner and outer radius of the annular beam are taken as a = 0.25R and b = 0.5R; the Lorentz factor is [gamma] = 6.
Various solutions have been suggested since Einstein's (1907) and Planck's (1907) initial proposal that the a moving body should appear cooler by a Lorentz factor, [gamma] [equivalent to] 1/[square root of (1 - [w.sup.2]/[c.sup.2]]) > 1, where w is the speed of the observer relative to the object.
This behavior suggests that, in some cases, the emission may originate from a jet consisting of "nuggets" whose angular size are less than 1/[GAMMA], where [GAMMA] is the hulk Lorentz factor. Timothy W.
A better way to express such velocities is that the "Lorentz factor" of the outflying material must be between 100 and 1,000.
for |absolute value of~ v |is less than~ c, where |Gamma~ is again the Lorentz factor |(1 - |v.sup.2~/|c.sup.2~).sup.-1/2~, and k is a positive dimensionless function of v/c.(26) The minus part in the |+ or -~ signs in (7) is removed by requiring that the transformations reduce to the identity transformation in the limit v |right arrow~ 0.
The above result implies that m is the Compton's angular frequency ([gamma][m.sub.0][c.sup.2]/[??]), and [absolute value of k] is the de Broglie wave number ([gamma][m.sub.0][upsilon]/[??]), where [gamma] is the Lorentz factor [5].
where [r.sub.e] = 2.82 x [10.sup.-15] m is classical radius for electron, [[gamma].sup.e] is the Lorentz factor of electron beam, and [mathematical expression not reproducible] are horizontal and vertical proton beam sizes at IP, respectively.