from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A messaging system that uses a computer network, especially the Internet, to transfer messages organized in thematic groups.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A world-wide distributed discussion system consisting of newsgroups classified hierarchically by subject.
From USENIX group of computer programmers using the operating system Unix, from users of Unix (Wiktionary)