subspaces

/S AH1 B S P EY0 S IH0 S/
noun
  1. 1

    A subset of a space which is a space in its own right.

  2. 2

    Any (often unspecified) method of communicating faster than light speed.

Source: https://en.wiktionary.org/wiki/subspace, https://en.wiktionary.org/wiki/subspaces