UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈflæt/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/flæt/ ,USA pronunciation: respelling(flat)

Inflections of 'flat' (adjadjective: Describes a noun or pronoun--for example, "a tall girl," "an interesting book," "a big house."):
adj comparative
adj superlative
Inflections of 'flat' (v): (⇒ conjugate)
v 3rd person singular
v pres pverb, present participle: -ing verb used descriptively or to form progressive verb--for example, "a singing bird," "It is singing."
v pastverb, past simple: Past tense--for example, "He saw the man." "She laughed."
v past pverb, past participle: Verb form used descriptively or to form verbs--for example, "the locked door," "The door has been locked."

WordReference Random House Learner's Dictionary of American English © 2020
flat1 /flæt/USA pronunciation   adj.,  flat•ter, flat•test, adv., n. 
  1. horizontally level:flat, white roofs on the houses of the Greek town.
  2. level, even, or smooth in surface, such as land or tabletops:the flat prairie.
  3. lying horizontally and at full length:flat on the floor.
  4. not deep, high, or thick:stacks of flat boxes at the pizzeria.
  5. spread out, as an unrolled map or the open hand:The map was flat on the table.
  6. with the air out;
    collapsed:a flat tire.
  7. absolute;
    definite:[before a noun]issued a flat denial of the charges.
  8. without the possibility of change or variation;
    fixed:[before a noun]The hotel charged a flat rate.
  9. lacking vitality or animation:a flat play.
  10. (of a carbonated beverage) having lost its bubbles:The soda is flat.
  11. pointless, as a remark or joke:a flat joke.
  12. (of paint) without gloss;
    not shiny;
  13. lacking variation in pitch;
    monotonous:answered in a flat, bored voice.
  14. Music and Dance
    • [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 sharp):The chorus was a little flat on that last song.

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

n. [countable]
  1. Clothinga woman's shoe with a very low heel or no heel.
  2. a flat surface, side, or part of anything:She held the stone in the flat of her hand.
  3. flat or level ground:salt flats.
  4. Music and Dance
    • (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.
  5. an automobile tire that has lost the air.
  1. Idiomsfall flat, [no object] to fail completely and noticeably:an attempt at humor that fell flat.
  2. Idiomsflat 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]
  1. British Termsa residential apartment:rented a flat in the city.

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

WordReference Random House Unabridged Dictionary of American English © 2020
flat1  (flat),USA pronunciation adj.,  flat•ter, flat•test, n., v.,  flat•ted, flat•ting, adv. 
  1. horizontally level:a flat roof.
  2. level, even, or without unevenness of surface, as land or tabletops.
  3. having a surface that is without marked projections or depressions:a broad, flat face.
  4. lying horizontally and at full length, as a person;
    prostrate:He was flat on the canvas after the knockdown.
  5. lying wholly on or against something:The banner was flat against the wall.
  6. thrown down, laid low, or level with the ground, as fallen trees or buildings.
  7. having a generally level shape or appearance;
    not deep or thick:a flat plate.
  8. (of the heel of a shoe) low and broad.
  9. spread out, as an unrolled map or the open hand.
  10. deflated;
    collapsed:a flat tire.
  11. absolute, downright, or positive;
    without qualification:a flat denial.
  12. without modification or variation:a flat rate.
  13. [Informal.]lacking money;
  14. without vitality or animation;
    dull:flat writing.
  15. having lost its flavor, sharpness, or life, as wine or food;
  16. (of a beverage) having lost its effervescence.
  17. without flavor;
    not spiced:flat cooking.
  18. prosaic, banal, or insipid:a flat style.
  19. pointless, as a remark or joke.
  20. commercially inactive:a flat day in the stock market.
  21. (of a painting) not having the illusion of volume or depth.
  22. (of a photograph or painting) lacking contrast or gradations of tone or color.
  23. (of paint) without gloss;
    not shiny;
  24. not clear, sharp, or ringing, as sound or a voice.
  25. lacking resonance and variation in pitch;
    monotonous:a flat delivery of the speech.
  26. [Music.]
    • (of a tone) lowered a half step in pitch:B flat.
    • below an intended pitch, as a note;
      too low (opposed to sharp).
  27. [Gram.]derived without change in form, as English to brush from the noun brush and adverbs that do not add -ly to the adjective form as fast, cheap, and slow.
  28. [Phonet.]lenis;
  29. [Naut.](of a sail)
    • cut with little or no fullness.
    • trimmed as nearly fore-and-aft as possible, for sailing to windward.
  30. flat a, the a-sound (a) of glad, bat, or act.
  31. flat aft, [Naut.]trimmed so that fore-and-aft sails present as flat a surface as possible, as in sailing close to the wind.
  32. flat on one's back. See  back (def. 19).

  1. something flat.
  2. a shoe, esp. a woman's shoe, with a flat heel or no heel.
  3. a flat surface, side, or part of anything:He struck me with the flat of his hand.
  4. flat or level ground;
    a flat area:salt flats.
  5. a marsh, shoal, or shallow.
  6. [Music.]
    • (in musical notation) the character ♭
      , which when attached to a note or to a staff degree lowers its significance one chromatic half step.
    • a tone one chromatic half step below another:The flat of B is B flat.
    • (on keyboard instruments, with reference to any given note) the key next below or to the left.
  7. [Theat.]a piece of scenery consisting of a wooden frame, usually rectangular, covered with lightweight board or fabric.
  8. a broad, thin book, chiefly for children:a juvenile flat.
  9. [Informal.]a deflated automobile tire.
  10. (in postal use) a large flat package, as in a manila envelope, for mailing.
  11. [Archit.]a flat roof or deck.
  12. [Naut.]
    • Also called  platform. a partial deck between two full decks.
    • a low, flat barge or lighter.
  13. [Shipbuilding.]
    • a broad, flat piece of iron or steel for overlapping and joining two plates at their edges.
    • a straight timber in a frame or other assembly of generally curved timbers.
  14. an iron or steel bar of rectangular cross section.
  15. [Textiles.]one of a series of laths covered with card clothing, used in conjunction with the cylinder in carding.
  16. [Photog.]one or more negatives or positives in position to be reproduced.
  17. [Print.]a device for holding a negative or positive flat for reproduction by photoengraving.
  18. [Hort.]a shallow, lidless box or tray used for rooting seeds and cuttings and for growing young plants.
  19. a similar box used for shipping and selling fruits and vegetables.
  20. [Football.]the area of the field immediately inside of or outside of an offensive end, close behind or at the line of scrimmage.
  21. flats, [Informal.]flat races between horses. Cf. flat race.

  1. to make flat.
  2. [Music.]to lower (a pitch), esp. one half step.

  1. to become flat.
  2. flat in, [Naut.]to pull the clew of (a fore-and-aft sail) as nearly amidships as possible. Also,  flatten in. 

  1. in a flat position;
  2. in a flat manner;
  3. completely;
    utterly:flat broke.
  4. exactly;
    precisely:She ran around the track in two minutes flat.
  5. [Music.]below the true pitch:to sing flat.
  6. Stock Exchange[Finance.]without interest.
  7. fall flat, to fail to produce the desired effect;
    fail completely:His attempts at humor fell flat.
  8. flat out, [Informal.]
    • without hesitation;
      directly or openly:He told us flat out he'd been a double agent.
    • at full speed or with maximum effort.
flatly, adv. 
flatness, n. 
  • Old Norse flatr, akin to Old English flet (see flat2), Greek platýs (see platy-, plate1
  • Middle English 1275–1325
    • 1.See corresponding entry in Unabridged plane. See  level. 
    • 4.See corresponding entry in Unabridged low, prone.
    • 11.See corresponding entry in Unabridged outright, peremptory, categorical.
    • 14.See corresponding entry in Unabridged boring, spiritless, prosaic.
    • 17.See corresponding entry in Unabridged vapid, unsavory.
    • 1, 4.See corresponding entry in Unabridged upright, vertical.
    • 14.See corresponding entry in Unabridged spirited.
    • 17.See corresponding entry in Unabridged savory.

flat2  (flat),USA pronunciation n. 
  1. British Terms[Chiefly Brit.]an apartment or suite of rooms on one floor forming a residence.
  • 1795–1805; variant of obsolete flet, Old English: floor, house, hall; akin to 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
  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
  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:
Collocations: UK: a [large, small, cosy, poky, spacious] flat, a flat [cap, roof, wall, surface, prairie, view, road, edge], UK: [an unfurnished, a fully-furnished, a furnished] flat, more...

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