| 1. | the lowest level of the ocean that light can reach. |
| 2. | an ill-defined area between two distinct conditions, categories, etc., usually comprising certain features of both; an indefinite boundary: a twilight zone between fantasy and reality. |

| twilight zone n. An area of ambiguity between two distinct states or conditions: a twilight zone between good and evil. |
twilight zone
[IRC] Notionally, the area of cyberspace where IRC operators live. An op is said to have a "connection to the twilight zone".
[The Jargon File]