flat

flat - noun

a level tract of land

a shallow box in which seedlings are started

a musical notation indicating one half step lower than the note named

freight car without permanent sides or roof

a deflated pneumatic tire

scenery consisting of a wooden frame covered with painted canvas; part of a stage setting

a suite of rooms usually on one floor of an apartment house

flat - adjective

lacking contrast or shading between tones
(of a musical note) lowered in pitch by one chromatic semitone
having a surface without slope, tilt in which no part is higher or lower than another
having a relatively broad surface in relation to depth or thickness
not modified or restricted by reservations
stretched out and lying at full length along the ground
flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)
lacking taste or flavor or tang
lacking stimulating characteristics; uninteresting
having lost effervescence
sounded or spoken in a tone unvarying in pitch
horizontally level
lacking the expected range or depth; not designed to give an illusion or depth
not reflecting light; not glossy
commercially inactive