"Background noise": The all-encompassing sound associated with a given environment at a specified time, usually a composite of sound from many sources and directions. Background noise remains in a given location in a given situation when all uniquely identifiable, discrete sound sources are eliminated, rendered insignificant, or otherwise not included.
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Background Noise has been defined 3 different ways in documents like Coral Reef Information System Glossary, Coral Reef Information System Glossary, Glossary of Terms - Yosemite National Park.
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