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

 

decibel

 noun
noun
BrE BrE//ˈdesɪbel//
 
; NAmE NAmE//ˈdesɪbel//
 
 
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a unit for measuring how loud a sound is Noise from the disco reached 110 decibels. Gary’s voice rose several decibels as he finally lost patience with them. Word Origin early 20th cent.: from deci- ‘ten’ + bel (the unit being one tenth of a bel).
See the Oxford Advanced American Dictionary entry: decibel