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v. at·ten·u·at·ed, at·ten·u·at·ing, at·ten·u·ates
1. To make slender, fine, or small: The drought attenuated the river to a narrow channel.
2. To reduce in force, value, amount, or degree; weaken: Medicine attenuated the fever's effect.
3. To lessen the density of; rarefy.
4. Biology To make (bacteria or viruses) less virulent.
5. Electronics To reduce (the amplitude of an electrical signal) with little or no distortion.
To become thin, weak, or fine.
adj. (-yo͞o-ĭt)
1. Reduced or weakened, as in strength, value, or virulence.
2. Botany Gradually tapering to a slender point.

[Latin attenuāre, attenuāt- : ad-, ad- + tenuāre, to make thin (from tenuis, thin; see ten- in Indo-European roots).]

at·ten′u·a′tion n.
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.


1. the act of attenuating or the state of being attenuated
2. (General Physics) the loss of energy suffered by radiation as it passes through matter, esp as a result of absorption or scattering
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(əˌtɛn yuˈeɪ ʃən)

1. the act of attenuating or the state of being attenuated.
2. the process by which a virus, bacterium, etc., changes under laboratory conditions to become harmless or less virulent.
[1585–95; (< Middle French) < Latin]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


1. Decrease in intensity of a signal, beam, or wave as a result of absorption of energy and of scattering out of the path of a detector, but not including the reduction due to geometric spreading, i.e., the inverse square of distance effect.
2. In mine warfare, the reduction in intensity of an influence as distance from the source increases.
3. In camouflage and concealment, the process of making an object or surface less conspicuous by reducing its contrast to the surroundings and/or background. Also called tone down.
Dictionary of Military and Associated Terms. US Department of Defense 2005.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.attenuation - weakening in force or intensity; "attenuation in the volume of the sound"
weakening - becoming weaker
2.attenuation - the property of something that has been weakened or reduced in thickness or density
weakness - the property of lacking physical or mental strength; liability to failure under pressure or stress or strain; "his weakness increased as he became older"; "the weakness of the span was overlooked until it collapsed"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


The depletion or sapping of strength or energy:
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.


[əˌtenjʊˈeɪʃən] Natenuación f, disminución 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


n (= weakening)Abschwächen nt, → Abschwächung f; (of statement also)Abmildern nt, → Abmilderung f; (= making thinner)Verdünnung f
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


n. atenuación, acto de disminución, esp. de una virulencia.
English-Spanish Medical Dictionary © Farlex 2012
References in classic literature ?
The transition was so sudden, without shade, without gradation of light, without attenuation of the luminous waves, that the orb seemed to have been extinguished by a powerful blow.
I saw him look at the loaf at supper (which happened to be a small one), as if nothing else stood between us and famine; and when my aunt insisted on his making his customary repast, I detected him in the act of pocketing fragments of his bread and cheese; I have no doubt for the purpose of reviving us with those savings, when we should have reached an advanced stage of attenuation.
The purpose of the research is to evaluate global attenuation models for their suitability for Pakistan and develop a functional form of the possible attenuation relationships based on available data.
It was found that droplets produce a lower level of attenuation than a continuous film of water, but their attenuation is different in the horizontal and vertical planes, while the continuous film presents a more uniform attenuation in both planes.--ALESSIO MANCINI (University of Oklahoma), J.
Making use of the lowest approximation of the cluster variation method and linear response theory of irreversible processes, Erdem and Keskin performed the calculations of the sound attenuation near the critical point in the Blume-Emery-Griffiths (BEG) model with zero crystal field [35-37].
Recently, a variety of investigations have focused on using existing microwave links which widely spread across countries for rain monitoring, validating, and optimizing the radar-based QPE, attenuation correction of radar observations, and so forth [e.g., [12, 13]].
In our method, we will divide the ground wave attenuation function presented by Wait [3, 4] into two attenuation factors representing the propagation effects of the finite ground conductivity and Earth's curvature, and these two attenuation factors have more clear and simple expressions in the frequency domain, which can be easily calculated by multiplying them rather than solving a complex differential equation related to Airy functions.
Under such circumstances, the paper conducted researches on the most common one-way bifurcation pipeline and adopted the shock wave attenuation law under laboratory one-way bifurcation pipeline to simulate shock wave attenuation law under the practical one-way bifurcation pipeline.
Where [P.sub.r]: received power, [P.sub.t]: transmitter power (in dBm), dr & dt the received and transmitted aperture (in cm), [theta]: divergence angle (in mrad), R: range link (in km), [alpha]: atmosphere attenuation. In relation fog, rain, and haze are atmospheric attenuation it's important to be taken into account of FSO system.
An attempt is made to study the attenuation of microwaves (8.2-12.4 GHz) by PPy doped PVC films.
In the present paper, an innovative method is developed for reconstructing distribution of the attenuation rate inside a reinforced concrete element from single-side measurements of AE activity.
Objective function was defined as the gamma attenuation of double-layer materials in a narrow (Figure 1(a)) and board beam (Figure 1(b)) [11].