plural of subspace

(countable, mathematics) A subset of a space which is a space in its own right. / (uncountable, science fiction) Any (often unspecified) method of communicating or travelling faster than light speed.

(BDSM) The psychological state of the submissive or "bottom" during sadomasochistic activity.

(topology) The topology of a subset S of a topological space X which is obtained by considering any subset of S to be an open set if it corresponds to the intersection of S with some open set of X.

plural of subspace topology

(linear algebra) A subset of vectors of a vector space which is closed under the addition and scalar multiplication of that vector space.