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

 

narrowband

 noun
noun
BrE BrE//ˈnærəʊbænd//
 
; NAmE NAmE//ˈnæroʊbænd//
 
[uncountable](specialist)
 
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signals that use a narrow range of frequencies compare broadband
See the Oxford Advanced American Dictionary entry: narrowband