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Definition of decibel

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de·ci·bel  audio  (ds-bl, -bl) KEY  

NOUN:
Abbr. dB
A unit used to express relative difference in power or intensity, usually between two acoustic or electric signals, equal to ten times the common logarithm of the ratio of the two levels.
ETYMOLOGY:
deci- + bel


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The American Heritage® Dictionary of the English Language, Fourth Edition.
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