- (n.) A homaloid space or extension.
- (n.) A level tract lying at little depth below the surface of water or alternately covered and left bare by the tide; a shoal; a shallow; a strand.
- (superl.) Clear; unmistakable; peremptory; absolute; positive; downright.
- (n.) A horizontal vein or ore deposit auxiliary to a main vein; also, any horizontal portion of a vein not elsewhere horizontal.
- (adv.) In a flat manner; directly; flatly.
- (n.) A flat-bottomed boat, without keel, and of small draught.
- (n.) A floor, loft or story in a building; especially, a floor of a house, which forms a complete residence in itself.
- (v.t.) To depress in tone, as a musical note; especially, to lower in pitch by half a tone.
- (v.i.) To fall form the pitch.
- (superl.) Lacking liveliness of commercial exchange and dealings; depressed; dull; as, the market is flat.
- (superl.) Wanting relief; destitute of variety; without points of prominence and striking interest.
- (v.t.) To render dull, insipid or spiritless; to depress.
- (superl.) Sonant; vocal; -- applied to any one of the sonant or vocal consonants, as distinguished from a nonsonant (or sharp) consonant.
- (adv.) Without allowance for accrued interest.
- (superl.) Unanimated; dull; uninteresting; without point or spirit; monotonous; as, a flat speech or composition.
- (n.) Something broad and flat in form.
- (v.t.) To make flat; to flatten; to level.
- (v.i.) To become flat or flattened; to sink or fall to an even surface.
- (n.) The flat part or side, of anything; as, the broad side of a blade, as distinguished from its edge.
- (n.) A character [/] before a note, indicating a tone which is a half step or semitone lower.
- (superl.) Having an even and horizontal surface or nearly so, without prominences or depressions; level without inclination; plane.
- (superl.) Not sharp or shrill; not acute; as, a flat sound.
- (n.) A car without a roof, the body of which is a platform without sides; a platform car.
- (n.) A platform on wheel, upon which emblematic designs, etc., are carried in processions.
- (n.) A level surface, without elevation, relief or prominences; an extended plain; specifically, in the United States, a level tract along the along the banks of a river; as, the Mohawk Flats.
- (superl.) Tasteless; stale; vapid; insipid; dead; as, fruit or drink flat to the taste.
- (n.) A straw hat, broad-brimmed and low-crowned.
- (n.) A dull fellow; a simpleton; a numskull.
- (superl.) Lying at full length or spread out, upon the ground; level with the ground or earth; prostrate; as, to lie flat on the ground; hence, fallen; laid low; ruined; destroyed.
- (superl.) Below the true pitch; hence, as applied to intervals, minor or lower by a half step; as, a flat seventh; A flat.
- (a.) Flattening at the ends; -- said of certain fruits.
- (a.) Having a head at a very obtuse angle to the shaft; -- said of a club.
- (a.) Not having an inflectional ending or sign, as a noun used as an adjective or an adjective as an adverb, without the addition of a formative suffix or an infinitive without the sign to. Many flat adverbs, as in run fast, buy cheap, are from AS. adverbs in -e, the loss of this ending having made them like the adjectives. Some having forms in ly, such as exceeding, wonderful, true, are now archaic.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). flat. Retrieved September 21, 2026, from http://smartdefine.org/flat/definitions/2008451 |
| Chicago | Webster's. 2011. "flat" http://smartdefine.org/flat/definitions/2008451 (accessed September 21, 2026). |
| Harvard | Webster's 2011, flat, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/flat/definitions/2008451>. |
| MLA | Webster's. "flat" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/flat/definitions/2008451> |