In geology, the terms basement and crystalline basement are used to define the rocks below a sedimentary platform or cover, or more generally any rock below sedimentary rocks or sedimentary basins that are metamorphic or igneous in origin. In the same way the sediments and/or sedimentary rocks on top of the basement can be called a "cover" or "sedimentary cover".
A basement has a slab bottom, and it uses steel or engineered wood members for floor framing. These members are stronger and span farther, eliminating the need for a lot of columns. This in turn opens up the basement and makes it functional.
The collection of rooms under the central wing where washers and dryers are located. Usually used in reference to the gameroom (Sparky's) which contains the wide-screen TV and VCR. Recently repainted and rededcorated in black and gold.