Wi-Fi (w??f??) A trademark for the certification of products that meet certain standards for transmitting data over wireless networks.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Wi-Fi (?wa??fa?) n (Computer Science) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014