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

flat - adverb

• with flat sails
• in a forthright manner; candidly or frankly

flat - thesaurus

apartment   bland   categoric   categorical   compressed   directly   flatbed   flatcar   flavorless   flavourless   insipid   level   mat   matt   matte   matted   monotone   monotonic   monotonous   plane   prostrate   savorless   savourless   straight   unconditional   vapid