n.
- A system for sending and receiving messages electronically over a computer network, as between personal computers.
- A message or messages sent or received by such a system.
To send (a message) by such a system.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.