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sone

[sohn] /soʊn/
noun
1.
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
1945-1950
1945-50; < Latin sonus sound1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sone

sone

/səʊn/
noun
1.
a subjective unit of loudness equal to that experienced by a normal person hearing a 1 kHz tone at 40 dB
Word Origin
C20: from Latin sonus a sound
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for sone
n.

unit of loudness, 1936, from Latin sonus (see sound (n.1)).

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for sone

unit of loudness. Loudness is a subjective characteristic of a sound (as opposed to the sound-pressure level in decibels, which is objective and directly measurable). Consequently, the sone scale of loudness is based on data obtained from subjects who were asked to judge the loudness of pure tones and noise. One sone is arbitrarily set equal to the loudness of a 1,000-hertz tone at a sound level of 40 decibels above the standard reference level (i.e., the minimum audible threshold). A sound with a loudness of four sones is one that listeners perceive to be four times as loud as the reference sound

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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