Definition of Flat

Adjective: flat (flatter,flattest) flat

Having a surface without slope, tilt in which no part is higher or lower than another
"a flat desk"; "skirts sewn with fine flat seams";
- level, plane
Having a relatively broad surface in relation to depth or thickness
"flat computer monitors"
Not modified or restricted by reservations
"a flat refusal";
- categoric, categorical, unconditional
Stretched out and lying at full length along the ground
"found himself lying flat on the floor";
- prostrate
(photography) lacking contrast or shading between tones
(of a musical note) lowered in pitch by one chromatic semitone
"B flat"
(biology) flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)
- compressed
Lacking taste, flavour or tang
"a flat diet";
- bland, flavorless [US], flavourless [Brit, Cdn], insipid, savorless [US], savourless [Brit, Cdn], vapid
Lacking stimulating characteristics; uninteresting
"a flat joke";
- bland
Having lost effervescence
"flat beer"; "a flat cola"
Sounded or spoken in a tone unvarying in pitch
"the owl's faint flat hooting";
- monotone, monotonic, monotonous
Horizontally level
"a flat roof"
Lacking the expected range or depth; not designed to give an illusion or depth
"a flat two-dimensional painting";
- two-dimensional, 2-dimensional
Not reflecting light; not glossy
"flat wall paint";
- mat, matt, matte, matted
Commercially inactive
"flat sales for the month"; "prices remained flat"; "a flat market"
[Brit] Drained of electric charge; discharged
"a flat battery";
- dead, drained

Noun: flat flat

A level tract of land
"the salt flats of Utah"
A shallow box in which seedlings are started
A musical notation indicating one half step lower than the note named
[N. Amer] Freight car without permanent sides or roof
- flatcar [N. Amer], flatbed
[N. Amer] A deflated pneumatic tire
- flat tire [N. Amer], flat tyre [Brit], puncture
Scenery consisting of a wooden frame covered with painted canvas; part of a stage setting
[Brit] A suite of rooms usually on one floor of an apartment house
- apartment

Adverb: flat flat

With flat sails
"sail flat against the wind"
In a forthright manner; candidly or frankly
"came out flat for less work and more pay";
- directly, straight

Verb: flat (flatted,flatting) flat