Definition of hi-fi in English:

hi-fi

Syllabification: hi-fi
Pronunciation: /ˈhīˌfī
 
/

adjective

Of, used for, or relating to the reproduction of music or other sound with high fidelity.
More example sentences
  • In the course of the night there will be a draw for a number of very attractive prizes including a colour TV, microwave and hi-fi music centre.
  • The pocket-sized WiFi base station is designed to stream music through a home hi-fi amplifier.
  • The lounge was empty, apart from Ailsa sitting in the corner wearing a pair of headphones and listening to music on the hi-fi system.

noun (plural hi-fis)

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A set of equipment for high-fidelity sound reproduction, especially a radio or phonograph.
More example sentences
  • In contrast, the price of equipment like TVs, hi-fis, radios and personal stereos has fallen - and now cost barely a quarter of what you paid for them 15 years ago.
  • They have seized thousands of pounds worth of property including televisions, videos, hi-fis, jewellery and mobile phones.
  • For example, children and teenagers tend to make their own living space in their bedrooms with personal entertainment in the form of computers, TVs, DVDs and hi-fis.

Origin

1950s: abbreviation of high fidelity.

Definition of hi-fi in:

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