Definitions from Wiktionary (subspace)

▸ noun:  (countable, mathematics) A subset of a space which is a space in its own right.
▸ noun:  (uncountable, science fiction) Any (often unspecified) method of communicating or travelling faster than light speed.
▸ noun:  (uncountable, science fiction) An alternative dimension or universe, access to or use of which permits faster-than-light travel or communications; hyperspace.
▸ noun:  (BDSM) The psychological state of the submissive or bottom during sadomasochistic activity.
▸ Also see subspace

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