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  1. The tailing off of sound in an enclosure because of multiple reflections from the boundaries. 
  2. a. The sound that's reflecting off surfaces in a room after the source has stopped producing that sound wave. Reverberation is usually considered to be a smooth decay in level of sound until it's not perceptible. b. An electronic effect designed to imitate the effect of natural reverberation. Source: Church Audio & Acoustics Glossary
  3. Sound that persists in an enclosed space, as a result of repeated reflection or scattering, after the sound source has stopped. Source: Glossary of Terms in Noise Control Engineering
  4. The persistence of sound in an enclosed or partially enclosed space after the source of sound has stopped; by extension, in some contexts, the sound that so persists. Source: http://www.owenscorning.com/around/sound/glossary.asp

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