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flat-footed
flat-four
flat money
flat out
flat-out
flat panel
flat price
flat race
flat rate
flat rocker
flat silver
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flat (1)

flat [ flat ]


adjective  (comparative flat·ter, superlative flat·test)
Definition:
 
1. level and horizontal: level and horizontal, without any slope
The flat plains stretch for miles.

2. even and smooth: even and smooth, without any bumps or hollows
back on the flat road

3. not curved: not curved inward or outward
a boat with a flat bottom

4. with little curvature: with relatively little depth or curvature
a vase with flat sides

5. lying horizontal: in a horizontal position, parallel with or stretched out on the ground
plants lying flat after the heavy rain

6. touching something else: with the whole extent touching another surface at all points
Stand it flat against the wall.

7. no longer bubbly: having lost effervescence
flat champagne

8. not full of air: no longer full of air
a flat tire

9. below correct pitch: sounded or sounding a little lower than the intended pitch level
Your E string is flat.

10. one half-step below natural: pitched one half-step below a particular note
in the key of B flat

11. lacking excitement: without any interest or excitement
Some days life just seems flat.

12. without flavor: lacking flavor or seasoning
This soup tastes flat.

13. monotonous in sound: with no variation in pitch or intonation
expressed her displeasure in a flat voice

14. commercially inactive: not commercially active
The market is fairly flat at the moment.

15. not varying: not varying in amount or level
They charge a flat fee of $50.

16. emphatically absolute: categorical and without any qualification
a flat denial of the charges

17. low-heeled: with low heels or no heels at all
flat shoes

18. not shiny: not shiny or glossy
a flat white paint

19. with low arches: describes feet with arches so low that all the sole makes contact with the ground

20. medicine indicating cessation of physiological activity: showing no variation on a monitoring machine, and thereby indicating that physiological activity has stopped
a flat EKG

21. phonetics resembling vowel sound in "fat": describes the vowel "a" as it is pronounced in "fat" or "badge"

22. nautical taut: describes a sail that is stretched so as to be taut



adverb  (comparative flat·ter, superlative flat·test)
Definition:
 
1. below pitch: below the intended pitch
She tends to sing flat.

2. exactly: no more and no less
He ran the mile in four minutes flat.

3. very: used to add emphasis ( informal )
flat broke

4. finance without interest: not accruing any interest
The bonds were trading flat.



noun  (plural flats)
Definition:
 
1. level surface: a flat part or surface
the flat of a knife blade

2. deflated tire: a tire that has become deflated ( informal )

3. music note lowered by half-step: a sign (♭) placed next to a note to show that it is to be lowered by a half-step, or a note that is lowered a half-step
a key with four flats

4. geography large stretch of level ground: a large stretch of level ground, e.g. of mud exposed at low tide or of salt deposits ( usually used in the plural )
the great salt flats

5. gardening shallow box for seedlings: a shallow lidless box or frame for seedlings

6. theater movable scenery: theatrical scenery mounted on a movable wooden frame

7. U.S. rail 
Same as  flatcar


8. nautical 
Same as  flatboat


9. mail big flat envelope: a large flat piece of mail



plural noun flats 
Definition:
 
dress low-heeled shoes: shoes with low heels



verb  (past and past participle flat·ted, present participle flat·ting, 3rd person present singular flats)
Definition:
 
1. transitive and intransitive verb U.S. flatten: to make something flat or become flat

2. transitive verb North America make note flat: to lower a note a half step

3. transitive verb North America sing or play something flat: to sing or play a note below the intended pitch

[14th century. < Old Norse flatr< Indo-European]

flat·ness noun
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