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Wi-Fi

[wahy-fahy]
Computers, Trademark.
  1. a brand name certifying that a device or other product is compatible with a set of broadband wireless networking standards.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for wi-fi

Wi-Fi

noun
  1. computing a system of accessing the internet from remote machines such as laptop computers that have wireless connections
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Word Origin

C20: from wi (reless) fi (delity)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for wi-fi

n.

1999, apparentlly from wireless; the second element perhaps suggested by hi-fi.

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Online Etymology Dictionary, © 2010 Douglas Harper