Word:

Attenuation

At`ten`u`a´tion
n.1.The act or process of making slender, or the state of being slender; emaciation.
2.The act of attenuating; the act of making thin or less dense, or of rarefying, as fluids or gases.
3.The process of weakening in intensity; diminution of virulence; as, the attenuation of virus.
Noun1.attenuation - weakening in force or intensity; "attenuation in the volume of the sound"
Synonyms: fading
2.attenuation - the property of something that has been weakened or reduced in thickness or density
(communications)attenuation - The progressive reduction in amplitude of a signal as it travels farther from the point of origin.

For example, an electric signal's amplitude reduces with distance due to electrical impedance. Attenuation is usually measured in decibels Attenuation does not imply appreciable modification of the shape of the waveform (distortion), though as the signal amplitude falls the signal-to-noise ratio will also fall unless the channel itself is noise free or the signal is amplified at some intermediate point(s) along the channel.

["Networking Essentials, second edition", Microsoft Corporation, pub. Microsoft Press 1997].
attenuate, fading, weakening
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