VoIP (v??????p??, voip)n. A communications protocol for transmitting telephone calls over a computer network, especially the internet.[V(oice) o(ver) IP.]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.VoIP (v??p) n1. (Computer Science) informal Voice over Internet Protocol: a system for converting analogue signals to digital so that telephone calls may be made over the internet2. (Telecommunications) informal Voice over Internet Protocol: a system for converting analogue signals to digital so that telephone calls may be made over the internetCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014