Computers, Trademark.
a brand name certifying that a device or other product is compatible with a set of broadband wireless networking standards.
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World English Dictionary
Wi-Fi (ˈwaɪˌfaɪ)
computing a system of accessing the internet from remote machines such as laptop computers that have wireless connections
[C20: from wi(reless) fi(delity)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Wifi can be a little tricky and spotty, but it's free and you can work it out
  with a little patience.
For free wifi which an outlet provides, it's technically possible to limit the
  duration per device.
Ideally it's wifi, decent room service menu, good gym and shower.
Seems over priced for what amounts to a stick from a mop, a remote control car,
  a processor and battery-operated wifi webcam.
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