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background

noun (SOUND)
 
 
/ˈbæk.ɡraʊnd/

Definition

B2 [S] sounds that can be heard behind other sounds that are louder: If you listen carefully to this piece of music, you can hear a flute in the background. We couldn't hear what they were saying on the tape - there was too much background noise.
(Definition of background noun (SOUND) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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