attenuations'

attenuation

[uh-ten-yoo-ey-shuhn]
noun
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.
3.
Physics. a decrease in a property, as energy, per unit area of a wave or a beam of particles, occurring as the distance from the source increases as a result of absorption, scattering, spreading in three dimensions, etc.

Origin:
1585–95; (< Middle French) < Latin attenuātiōn- (stem of attenuātiō). See attenuate, -ion

subattenuation, noun
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World English Dictionary
attenuation (əˌtɛnjʊˈeɪʃən)
 
n
1.  the act of attenuating or the state of being attenuated
2.  the loss of energy suffered by radiation as it passes through matter, esp as a result of absorption or scattering

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Etymonline
Word Origin & History

attenuation
1590s, from L. attenuationem (nom. attenuatio), noun of action from attenuatus, pp. of attenuare (see attenuate).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

attenuation at·ten·u·a·tion (ə-těn'yōō-ā'shən)
n.

  1. A dilution, thinning, or weakening of a substance, especially a reduction in the virulence of a pathogen through repeated inoculation, growth in a different culture medium, or exposure to heat, light, air or other weakening agents.

  2. The energy loss of an ultrasonic beam as it passes through a material.

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