The rock layer below which economic hydrocarbon reservoirs are not expected to be found, sometimes called economic basement. Basement is usually older, deformed igneous or metamorphic rocks, which sel [..]

That portion of a building that is partly or completely below grade.

"lowest story of a building except the cellar," 1730, from base (v.) + -ment.

Harder and usually older igneous and metamorphic rocks that underlie the main sedimentary rock sequences (softer and usually younger) of a region and extend downward to the base of the crust.

the lowermost portion of a structure partly or wholly below ground level; often used for storage the ground floor facade or interior in Renaissance architecture (based) having a base; "fi [..]

the lowest part of a building, usually below the ground

To dream that you are in a basement, foretells that you will see prosperous opportunities abating, and with them, pleasure will dwindle into trouble and care. See Cellar.   

Pursuant to 44 CFR 59.1 [Title 44 -- Emergency Management and Assistance Chapter I -- Federal Emergency Management Agency, Department of Homeland Security], the term basement means “any area of the bu [..]

(n) the lowermost portion of a structure partly or wholly below ground level; often used for storage(n) the ground floor facade or interior in Renaissance architecture

A below-grade portion of a partially or mostly above-ground building

Any floor below the first story in a building.

The bottom part of an engine, that consists of the crankshaft, connecting rods, and pistons. The other term can be called the bottom end.

The bottom part of the engine: crankshaft, connecting rods and pistons. Also called the bottom end.

Partially or predominantly below grade with its entrance level with the basement floor.

The hangar bay of an aircraft carrier.

Any area of the building, including any sunken room or sunken portion of a room, having its floor below ground level (subgrade) on all sides.

A type of house construction where the bottom livable level has a slab or earthen floor which averages three feet or more below grade level on one or more sides of the house.

Older igneous and metamorphic rocks beneath usually unmetamorphosed sediments.

Hangar deck of the aircraft carrier.

The double-3.

The double-3.

Usually the lowest story of a building, either partly or entirely below ground level.

The storage compartment of RV’s under the main living area. Basements are generally found on motor homes and fifth wheel trailers.

Layer in the earth's crust below which hydrocarbon accumulations are not expected to be found. Often the base of the sedimentary sequence and usually composed of relatively old, igneous or metamo [..]

Unproductive rock underlying sedimentary rock.

Any igneous or metamorphic rock, or rocks or any stratum of such nature, in and below which the geological structure or physical characteristics of the rock sequence do not have the properties necessary for the accumulation of Petroleum in commercial quantities and which reflects the maximum depth at which any such accumulation can be reasonably ex [..]

Layer in the earth's crust below which hydrocarbon accumulations are not expected to be found. Often the base of the sedimentary sequence and usually composed of relatively old, igneous or metamorphic rocks, which tend to have distinctive geophysical characteristics (e.g. seismic response, density and magnetism) from the overlying sedimentary [..]

A storey of a building below the principal storey, usually below ground level. A cellar is defined as any underground room or vault, usually taken to mean for storage use rather than habitation. When considering extending a building below ground, waterproofing and resistance to earth pressure are key design issues. Party Wall agreements and the sup [..]