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sone

[sohn]
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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.
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Origin of sone

1945–50; < Latin sonus sound1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for sone

sone

noun
  1. a subjective unit of loudness equal to that experienced by a normal person hearing a 1 kHz tone at 40 dB
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Word Origin

C20: from Latin sonus a sound
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for sone

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper