- Flat Flat, n.
1. A level surface, without elevation, relief, or
prominences; an extended plain; specifically, in the
United States, a level tract along the along the banks of
a river; as, the Mohawk Flats.
Envy is as the sunbeams that beat hotter upon a bank, or steep rising ground, than upon a flat. --Bacon. [1913 Webster]
Half my power, this night Passing these flats, are taken by the tide. --Shak. [1913 Webster]
3. Something broad and flat in form; as: (a) A flat-bottomed boat, without keel, and of small draught. (b) A straw hat, broad-brimmed and low-crowned. (c) (Railroad Mach.) A car without a roof, the body of which is a platform without sides; a platform car. (d) A platform on wheel, upon which emblematic designs, etc., are carried in processions. [1913 Webster]
5. (Arch.) A floor, loft, or story in a building; especially, a floor of a house, which forms a complete residence in itself; an apartment taking up a whole floor. In this latter sense, the usage is more common in British English. [1913 Webster +PJC]
Or if you can not make a speech, Because you are a flat. --Holmes. [1913 Webster]
The Collaborative International Dictionary of English. 2000.