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  1. d, [T-1]; dB/s—for airborne sound, the rate of decrease of vibratory acceleration, velocity, or displacement level after the excitation has stopped. Source: http://www.owenscorning.com/around/sound/glossary.asp
  2. A measure of the decay of acoustical signals, expressed as a slope in dB/second.
  3. At a stated frequency, time rate at which sound pressure level decreases in a room. Unit, decibel per second (dB/s). Decay rate d in a reverberant room is related to reverberation time T by T = 60 dB / d. Source: Glossary of Terms in Noise Control Engineering

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