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backfile
backfill
backfire
backflip
backflow
backgammon
background
background music
background noise
background processing
background radiation
backgrounder
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background noise
back·ground noise


noun 
Definition:
 
noise heard but not listened to: noise that is sufficiently loud to be heard but not so loud as to obscure what is actually being listened to
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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