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

 

amplifier

 noun
noun
BrE BrE//ˈæmplɪfaɪə(r)//
 
; NAmE NAmE//ˈæmplɪfaɪər//
 
(informal amp) Live music, Devices
 
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an electrical device or piece of equipment that makes sounds or radio signals louder a 25 watt amplifier See related entries: Live music, Devices
See the Oxford Advanced American Dictionary entry: amplifier