WordReference Random House Learner's Dictionary of American English © 2015
flat1 /flæt/USA pronunciation adj., flat•ter, flat•test,adv., n. 

  • horizontally level:flat, white roofs on the houses of the Greek town.
  • level, even, or smooth in surface, such as land or tabletops:the flat prairie.
  • lying horizontally and at full length:flat on the floor.
  • not deep, high, or thick:stacks of flat boxes at the pizzeria.
  • spread out, as an unrolled map or the open hand:The map was flat on the table.
  • with the air out; deflated;
    collapsed:a flat tire.
  • [before a noun] absolute;
    definite:issued a flat denial of the charges.
  • [before a noun] without the possibility of change or variation; fixed:The hotel charged a flat rate.
  • lacking vitality or animation:a flat play.
  • (of a carbonated beverage) having lost its bubbles:The soda is flat.
  • pointless, as a remark or joke:a flat joke.
  • (of paint) without gloss; not shiny;
  • lacking variation in pitch;
    monotonous:answered in a flat, bored voice.
    • [after a letter indicating tone] (of a tone) lowered a half step in pitch:B flat.
    • below an intended pitch, such as a note; too low (opposed to sharpsharp):The chorus was a little flat on that last song.

  • in a flat position;
    levelly:The trees had been laid flat by the hurricane.
  • completely; utterly:flat broke until payday.
  • [after a measurement of time] exactly;
    precisely:I got there in two minutes flat.
  • Music and Dancebelow the true pitch:to sing flat.

  • n. [countable]
  • Clothinga woman's shoe with a very low heel or no heel.
  • a flat surface, side, or part of anything:She held the stone in the flat of her hand.
  • flat or level ground:salt flats.
    • (in musical notation) the character ♭, which indicates that the pitch of a note is lowered by one half step.
    • a tone that is one half step below another.
  • an automobile tire that has lost the air.
  • idiom
    1. Idiomsfall flat, [no object] to fail completely and noticeably:an attempt at humor that fell flat.
    flat out, [Informal.]
    • without hesitation;
      directly or openly:The spy told us flat out he had been a double agent.
    • at full speed or with maximum effort:We drove flat out to get there by afternoon.

    flat•ly, adv. 
    flat•ness, n. [uncountable]

    flat2 /flæt/USA pronunciation n. [countable]

      British Termsa residential apartment:rented a flat in the city.

    -flat-, root. 

      -flat- comes from Latin, where it has the meaning "blow;
      wind.'' This meaning is found in such words as: deflate, inflate.

    WordReference Random House Learner's Dictionary of American English © 2015
    ˈflat-ˈout,  adj. [Informal.]
    1. Informal Termsusing full speed or all of one's resources:a flat-out effort.
    2. Informal Termscomplete:a flat-out forgery.
    See flat out under flat1. 

    Collins Concise English Dictionary © HarperCollins Publishers::

    flat /flæt/ adj (flatter, flattest)
    1. horizontal; level: flat ground, a flat roof
    2. even or smooth, without projections or depressions: a flat surface
    3. lying stretched out at full length; prostrate: he lay flat on the ground
    4. having little depth or thickness; shallow: a flat dish
    5. (postpositive) often followed by against: having a surface or side in complete contact with another surface: flat against the wall
    6. (of a tyre) deflated, either partially or completely
    7. (of shoes) having an unraised or only slightly raised heel
    8. chiefly Brit (of races, racetracks, or racecourses) not having obstacles to be jumped
    9. of, relating to, or connected with flat racing as opposed to steeplechasing and hurdling
    10. without qualification; total: a flat denial
    11. without possibility of change; fixed: a flat rate
    12. (prenominal or immediately postpositive) neither more nor less; exact: he did the journey in thirty minutes flat, a flat thirty minutes
    13. unexciting or lacking point or interest: a flat joke
    14. without variation or resonance; monotonous: a flat voice
    15. (of food) stale or tasteless
    16. (of beer, sparkling wines, etc) having lost effervescence, as by exposure to air
    17. (of trade, business, a market, etc) commercially inactive; sluggish
    18. (of a battery) fully discharged; dead
    19. (of a print, photograph, or painting) lacking contrast or shading between tones
    20. (of paint) without gloss or lustre; matt
    21. (of a painting) lacking perspective
    22. (of lighting) diffuse
    23. (immediately postpositive) denoting a note of a given letter name (or the sound it represents) that has been lowered in pitch by one chromatic semitone: B flat
    24. (of an instrument, voice, etc) out of tune by being too low in pitch
      Compare sharp
    25. flat athe vowel sound of a as in the usual US or S Brit pronunciation of hand, cat, usually represented by the symbol (æ)
    1. in or into a prostrate, level, or flat state or position: he held his hand out flat
    2. completely or utterly; absolutely
    3. lower than a standard pitch
    4. too low in pitch: she sings flat
      Compare sharp
    5. fall flatto fail to achieve a desired effect, etc
    6. flat outinformal with the maximum speed or effort
    7. totally exhausted
    1. a flat object, surface, or part
    2. (often plural) a low-lying tract of land, esp a marsh or swamp
    3. (often plural) a mud bank exposed at low tide
    4. an accidental that lowers the pitch of the following note by one chromatic semitone
      Usual symbol:
    5. a note affected by this accidental
      Compare sharp
    6. a rectangular wooden frame covered with painted canvas, etc, used to form part of a stage setting
    7. a punctured car tyre
    8. chiefly Brit the flat(often cap.) flat racing, esp as opposed to steeplechasing and hurdling
    9. the season of flat racing
    10. a flatboat or lighter
    11. US Canadian a shallow box or container, used for holding plants, growing seedlings, etc
    vb (flats, flatting, flatted)
    1. to make or become flat
    2. the usual US word for flatten

    See also flatsEtymology: 14th Century: from Old Norse flatr; related to Old High German flaz flat, Greek platus flat, broad

    ˈflatly adv ˈflatness n
    flat /flæt/ n
    1. a set of rooms comprising a residence entirely on one floor of a building
      Usual US and Canadian name: apartment
    vb (flats, flatting, flatted)(intransitive)
    1. Austral NZ to live in a flat (with someone)
    Etymology: Old English flett floor, hall, house; related to flat1

    'flat' also found in these entries:

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