"attenuations" in the noun sense
1. attenuation, fading
weakening in force or intensity
"attenuation in the volume of the sound"
2. attenuation
the property of something that has been weakened or reduced in thickness or density
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License