sones'

sone

[sohn]
noun
a unit for measuring the loudness of sound, equal to the loudness of a sound that, in the judgment of a group of listeners, is equal to that of a 1000-cycle-per-second reference sound having an intensity of 40 decibels.

Origin:
1945–50; < Latin sonus sound1

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World English Dictionary
sone (səʊn)
 
n
a subjective unit of loudness equal to that experienced by a normal person hearing a 1 kHz tone at 40 dB
 
[C20: from Latin sonus a sound]

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