Definition of Wi-Fi in English:

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Wi-Fi

Pronunciation: /ˈwʌɪfʌɪ/

noun

trademark
A facility allowing computers, smartphones, or other devices to connect to the Internet or communicate with one another wirelessly within a particular area.
Example sentences
  • While Wi-Fi is becoming a standard feature on notebooks, network coverage is anything but ubiquitous.
  • Add Wi-Fi, standard now on most new laptops, and your home office can be anywhere.
  • It will also deploy a Wi-Fi network to keep assorted hacks and photographers in touch.

Origin

1990s: from wireless + an apparently arbitrary second element, after hi-fi; sometimes incorrectly interpreted as a shortening of Wireless Fidelity.

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