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instant messaging

noun, Digital Technology.
1.
a system for exchanging typed electronic messages instantly via the Internet or a cellular network, using a shared software application on a personal computer or mobile device.
Abbreviation: IM.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for instant mess aging

instant messaging

noun
1.
(computing) the online facility that allows the instant exchange of written messages between two or more people using different computers or mobile phones Abbreviation IM
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
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instant mess aging in Culture
instant messaging (IM)

A computer communications program that allows people to send and receive typed messages very rapidly. It is often used for online “chats.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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