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1. an area of a city or town, usually surrounding the central business district, where houses have become dilapidated
2. the lowest level of the ocean to which light can penetrate
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
twilight zone[′twī‚līt ‚zōn]
That zone of the earth or other planet in twilight at any time.
Anything resembling the twilight zone of the earth, as the narrow sector on each side of the equisignal zone of a four-course radio range station, in which one signal is barely heard above the monotone on-course signal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
[IRC] Notionally, the area of cyberspace where IRC operators live. An op is said to have a "connection to the twilight zone".
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)