Definition of basement in English:
1The floor of a building partly or entirely below ground level.
- The house is divided horizontally so that she has the basement and ground floor and he has the first and second.
- Radon levels are generally highest in basements and ground floor rooms that are in contact with the soil.
- They all have two storeys - either basement and ground, or first floor and attic space.
1.1 Geology The oldest formation of rocks underlying a particular area.
- The best preserved eclogites are found in mafic rocks hosted within the basement sequence.
- However, basement rocks can also be inferred from exposures in the uplands that surround the basin.
- The nature of the magnetic basement underlying the east side of the profile is enigmatic.
Mid 18th century: probably from archaic Dutch basement 'foundation', perhaps from Italian basamento 'column base'.
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