Definition of Wi-Fi in English:

Wi-Fi

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.

    • ‘It will also deploy a Wi-Fi network to keep assorted hacks and photographers in touch.’
    • ‘While Wi-Fi is becoming a standard feature on notebooks, network coverage is anything but ubiquitous.’
    • ‘Unlike the PowerBooks, they do not ship with Wi-Fi or Bluetooth as standard.’
    • ‘If you haven't yet installed a Wi-Fi network in your home, let me tell you that you have no idea what you're missing.’
    • ‘Add Wi-Fi, standard now on most new laptops, and your home office can be anywhere.’

Origin

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

Pronunciation

Wi-Fi

/ˈwʌɪfʌɪ/