WordReference Random House Unabridged Dictionary of American English © 2026
sub•space
(sub′spās′),USA pronunciation n.
- a smaller space within a main area that has been divided or subdivided:The jewelry shop occupies a subspace in the hotel's lobby.
- Mathematics
- a subset of a given space.
- Also called linear manifold. a subset of a vector space which is itself a vector space.
- a subset of a topological space, having the relative topology.
- sub- + space 1925–30
'subspace' also found in these entries (note: many are not synonyms or translations):