A flat is an apartment. It's called a flat because all the rooms in it are usually on the same floor. The word flat is much more common in British than American English.
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level, flat, plane, even, smooth mean having a surface without bends, curves, or irregularities. level applies to a horizontal surface that lies on a line parallel with the horizon. flat applies to a surface devoid of noticeable curvatures, prominences, or depressions.
Flat land is level, with no high hills or other raised parts. To the north lie the flat and fertile farmlands of Nebraska.
FLAT definition: 1. level and smooth, with no curved, high, or hollow parts: 2. level but having little or no…. Learn more.
Define flat. flat synonyms, flat pronunciation, flat translation, English dictionary definition of flat. adj. flat ter , flat test 1. a. Having a smooth, even surface: a flat field. See Synonyms at level. b. Having a relatively broad level surface in relation...
Geometrically, something flat is an even, level plane, like Kansas relative to the Rocky Mountains, or the cargo area of a flatbed truck. As an adjective, flat means "less than lively."
The noun is from Middle English flat (“level piece of ground, flat edge of a weapon”), from the adjective. The algebraic sense was coined by Serre in a 1956 paper, originally as French plat.