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Related to Ambient noise: background noise
ambient noise[′am·bē·ənt ′nȯiz]
The pervasive noise associated with a given environment, being usually a composite of sounds from sources both near and distant.
The background noise level in a space, which is not identifiable as being from a specific source, such as a nearby piece of equipment.
The all-encompassing, average background noise associated with a given environment, often a composite of sounds from many sources near and far, of many different types, e.g., the general background noise in a neighborhood or in an auditorium.