Definitions for "Usenet Newsgroup"
Keywords:  alt, bulletin, discuss, limbaugh, topic
An area on the Internet reserved for discussion of a certain, single topic. Messages are "posted" in the Newsgroup and "replies" are encouraged. Broken into many different subjects (approx. 25,000) newsgroup titles usually begin with a three or four letter prefix followed by a "." For example alt., soc., comp., misc., rec., and sci. just to name a few.
a bulletin-board style messaging system organized around specific topics
a "discussion" forum - almost like a bulletin board