the lowest part of a building, partly or wholly below ground level

room on lower floor of building

of base

physical foundation

the basic substance used to make, develop, build, measure etc something

physical foundation

a placing of the feet; surface for standing on; a (mentioned) relationship (with people)

foundation, basis

the act of establishment (a university, church etc); a strong base of a building, on which it is built

basis for something physical or mental

the body of a plane (to which the engine(s), wings and tail are fitted)

bulk; central portion

to treat as very important or special

support for something

a square base or block on which a pillar or statue stands

support for something

the act, process, of preparing; something done to get ready

development, readiness

the act of supporting or being supported; something that supports weight; money etc to live on; to bear the weight of (something); keep (something) in place

something that holds up structure