the ambiguous region between two categories or states or conditions (usually containing some features of both); "but there is still a twilight zone, the tantalizing occurrences that are probably noise noise but might possibly be a signal"; "in the twilight zone between humor and vulgarity"; "in that no man's land between negotiation and aggression"
An area of ambiguity between two distinct states or conditions: a twilight zone between good and evil. a US television programme, originally made between 1959 and 1963, and then again in the 1980s, with a different story and characters each week. The stories usually deal with supernatural events or science fiction
lowest ocean depth that light can reach; "in-between" area, indistinct boundary between two conditions (or categories, etc.); (Internet) area of cyberspace occupied by IRC operators