Answer: subspaces

AnswerCrossword Clue
SUBSPACESAreas within areas
SUBSPACESRegions within regions
subspaces(in science fiction) A hypothetical space-time continuum used for communication at a speed faster than that of light
subspacesSUBSPACE, a subset of a mathematical space
subspacesA space that is wholly contained in another space, or whose points or elements are all in another space