reverberation time

noun
the time it takes for a sound made in a room to diminish by 60 decibels.

Origin:
1925–30

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World English Dictionary
reverberation time
 
n
a measure of the acoustic properties of a room, equal to the time taken for a sound to fall in intensity by 60 decibels. It is usually measured in seconds

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
These commenters recommended specifications for background noise levels, reverberation time, and the signal to noise ratio.
We expect to conduct comparable reverberation time measurements post-treatment.
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