subspace

Short definition from Wiktionary

Noun

1. 1
   A subset of a space which is a space in its own right.
2. 2
   Any (often unspecified) method of communicating or travelling faster than light speed.
3. 3
   An alternative dimension or universe, access to or use of which permits faster-than-light travel or communications; hyperspace.
4. 4
   The psychological state of the submissive or bottom during sadomasochistic activity.