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

hi-fi

noun
 
/ˈhaɪ faɪ/
 
/ˈhaɪ faɪ/
[countable, uncountable]
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  1. equipment for playing recorded music that produces high-quality stereo sound compare high fidelityTopics Musicc1, Houses and homesc1
    Word Origin1950s: abbreviation of high fidelity.
See hi-fi in the Oxford Advanced American Dictionary

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