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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.


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


(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]


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.
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"


The depletion or sapping of strength or energy:


[əˌtenjʊˈeɪʃən] Natenuación f, disminución f


n (= weakening)Abschwächen nt, → Abschwächung f; (of statement also)Abmildern nt, → Abmilderung f; (= making thinner)Verdünnung f


n. atenuación, acto de disminución, esp. de una virulencia.
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.
Each renal mass was assessed according to: Absolute attenuation values and the degree of enhancement in each phase of CT measured and evaluated.
Safety eyewear with wider frames can cause noticeable gaps in the cushion seal, resulting in a potential attenuation loss of 5-10 dB and so should not be used.
Keywords: Hybrid imaging, PET/CT, PET/MRI, Attenuation correction, Simultaneous PET/MRI.
In this paper, we revisit the attenuation constant of a dielectric rectangular tunnel and show that it can be derived based on the well-known Fresnel reflection coefficients.
In this paper, we present a study on the inverted microstrip line up to 100 GHz and a simulated attenuation coemcient as low as 0.
The DSHA approach consists of identification of potential sources, which in conjunction with appropriate ground-motion attenuation models yields expected ground shaking for the target area.
In this letter, a novel defected ground structure with two attenuation poles is provided.
Therefore, the attenuation of electromagnetic wave in plasma can be acquired and expressed as following:
These models grossly overestimate the concentration of the small diameter raindrops in the tropical regions hence the Ajayi and Olsen (1985) [6] model was proposed and found suitable for the modelling of tropical rain drop size distributions and equally adequate for the determination of the specific attenuation.
Then ultrasonic diagnosis as a novel technique was performed to investigate the influences of the PA6 concentration and the HDPE-g-MAH content on the ultrasonic velocity and attenuation.