Definition of hum noun from the Oxford Advanced Learner's Dictionary

 

hum

 noun
noun
BrE BrE//hʌm//
 
; NAmE NAmE//hʌm//
 
 
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[singular] hum (of something) a low continuous sound the hum of bees/traffic/voices The room filled with the hum of conversation. the background hum of the air-conditioning Word Origin late Middle English: imitative.
See the Oxford Advanced American Dictionary entry: hum

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