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Flat, or flatness, describes an object or condition that is very smooth or level.

In Great Britain, Ireland and Australia, as well as in English spoken in Commonwealth countries such as India, a "flat" means an apartment.

In New Zealand it can mean an apartment, especially when applied to public housing, but it more usually means a house of any type shared between unrelated adults, in a flatmate arrangement.

Flat or flats may also refer to:





Mathematics and geometry[edit]


  • Flat, a deflated pneumatic tire
  • Flat car, an open container on wheels designed to carry heavy loads
  • Flat spot, a fault in the shape of a railroad wheel
  • Flat wagon, a railway goods wagon with a flat deck for transporting e.g. vehicles

Other uses[edit]

See also[edit]