IPA: /ˈsʌbˌspeɪs/
KK: /sʌbˌspeɪs/
A smaller part of a larger space that still has its own structure and properties.
In mathematics, a subspace can be used to simplify complex problems by focusing on a smaller area.
Subspace → It is formed from "sub-" (meaning under or below) and "space" (from Latin "spatium", meaning area or extent). The word "subspace" refers to a space that is under or a part of a larger space.
Think of something that is 'under' ('sub-') a larger 'area' ('space') — that's what subspace means.