flat (Noun) — A level tract of land. ex. "the salt flats of Utah"
flat (Noun) — A shallow box in which seedlings are started.
flat (Noun) — A musical notation indicating one half step lower than the note named.
flat (Noun) — Freight car without permanent sides or roof.
flat (Noun) — A deflated pneumatic tire.
flat (Noun) — Scenery consisting of a wooden frame covered with painted canvas; part of a stage setting.
flat (Noun) — A suite of rooms usually on one floor of an apartment house.
flat (Adjective) — Having a surface without slope, tilt in which no part is higher or lower than another. ex. "a flat desk" ex. "skirts sewn with fine flat seams"
flat (Adjective) — Having a relatively broad surface in relation to depth or thickness. ex. "flat computer monitors"
flat (Adjective) — Not modified or restricted by reservations. ex. "a flat refusal"
flat (Adjective) — Stretched out and lying at full length along the ground. ex. "found himself lying flat on the floor"
flat (Adjective) — (photography) lacking contrast or shading between tones.
flat (Adjective) — (of a musical note) lowered in pitch by one chromatic semitone. ex. "B flat"
flat (Adjective) — (biology) flattened laterally along the whole length (e.g., certain leafstalks or flatfishes).
flat (Adjective) — Lacking taste, flavour or tang. ex. "a flat diet"
flat (Adjective) — Lacking stimulating characteristics; uninteresting. ex. "a flat joke"
flat (Adjective) — Having lost effervescence. ex. "flat beer" ex. "a flat cola"
flat (Adjective) — Sounded or spoken in a tone unvarying in pitch. ex. "the owl's faint flat hooting"
flat (Adjective) — Horizontally level. ex. "a flat roof"
flat (Adjective) — Lacking the expected range or depth; not designed to give an illusion or depth. ex. "a flat two-dimensional painting"
flat (Adjective) — Not reflecting light; not glossy. ex. "flat wall paint"
flat (Adjective) — Commercially inactive. ex. "flat sales for the month" ex. "prices remained flat" ex. "a flat market"
flat (Adjective) — Drained of electric charge; discharged.
flat (Verb) — Live in or share an apartment.
flat (Verb) — (music) lower a note in pitch.
flat (Adverb) — With flat sails. ex. "sail flat against the wind"
flat (Adverb) — In a forthright manner; candidly or frankly. ex. "came out flat for less work and more pay"