Definition of hi-fi noun from the Oxford Advanced Learner's Dictionary

 

hi-fi

 noun
noun
BrE BrE//ˈhaɪ faɪ//
 
; NAmE NAmE//ˈhaɪ faɪ//
 
[countable, uncountable]
 
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equipment for playing recorded music that produces high-quality stereo sound Word Origin 1950s: abbreviation of high fidelity.

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