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Definition of "flat" []

  • Having a horizontal surface without a slope, tilt, or curvature. (adjective)
  • Having a smooth, even, level surface: a skirt sewed with fine flat seams. (adjective)
  • Having a relatively broad surface in relation to thickness or depth: a flat board. See Synonyms at level. (adjective)
  • Stretched out or lying at full length along the ground; prone. (adjective)
  • Free of qualification; absolute: a flat refusal. (adjective)
  • Horizontal; level (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • Even or smooth, without projections or depressions (adjective)
  • Lying stretched out at full length; prostrate (adjective)
  • Having little depth or thickness; shallow (adjective)
  • Having a surface or side in complete contact with another surface (adjective)
  • Spread out, unrolled, or levelled (adjective)
  • (of a tyre) deflated, either partially or completely (adjective)
  • (of shoes) having an unraised or only slightly raised heel (adjective)
  • (of races, racetracks, or racecourses) not having obstacles to be jumped (adjective)
  • Of, relating to, or connected with flat racing as opposed to steeplechasing and hurdling (adjective)
  • Without qualification; total (adjective)
  • Without possibility of change; fixed (adjective)
  • Neither more nor less; exact (adjective)
  • Unexciting or lacking point or interest (adjective)
  • Without variation or resonance; monotonous (adjective)
  • (of food) stale or tasteless (adjective)
  • (of beer, sparkling wines, etc) having lost effervescence, as by exposure to air (adjective)
  • (of trade, business, a market, etc) commercially inactive; sluggish (adjective)
  • (of a battery) fully discharged; dead (adjective)
  • (of a print, photograph, or painting) lacking contrast or shading between tones (adjective)
  • (of paint) without gloss or lustre; matt (adjective)
  • (of a painting) lacking perspective (adjective)
  • (of lighting) diffuse (adjective)
  • Denoting a note of a given letter name (or the sound it represents) that has been lowered in pitch by one chromatic semitone (adjective)
  • (of an instrument, voice, etc) out of tune by being too low in pitch (adjective)
  • In or into a prostrate, level, or flat state or position (adverb)
  • Completely or utterly; absolutely (adverb)
  • Exactly; precisely (adverb)
  • Lower than a standard pitch (adverb)
  • Too low in pitch (adverb)
  • A flat object, surface, or part (noun)
  • A low-lying tract of land, esp a marsh or swamp (noun)
  • A mud bank exposed at low tide (noun)
  • An accidental that lowers the pitch of the following note by one chromatic semitone (noun)
  • A note affected by this accidental (noun)
  • A rectangular wooden frame covered with painted canvas, etc, used to form part of a stage setting (noun)
  • A punctured car tyre (noun)
  • A flatboat or lighter (noun)
  • A shallow box or container, used for holding plants, growing seedlings, etc (noun)
  • To make or become flat (verb)

www.Collinsdictionary.com (c) HarperCollins Publishers Ltd 2016

Use "flat" in a sentence
  • "To summarize my previous comment, the LT data does not track surface temperature at all well – the LT temperature trend is essentially flat from ~1978 to ~1998, then there is the large 1998 El Nino spike and reversal, and then a ~0.2C step-up which has stayed ~flat for the most recent ~5 years."
  • "Now if, _at the present moment_, this skein were cut with a straight knife at right angles to its length, the cut end would represent the _time plane_ -- that is, the present moment of all -- and it would be the same for all providing that the time plane were flat _But is it really flat_?"
  • "V. i.112 (241,5) [as fat and fulsome] [W: flat] _Fat_ means _dull_; so we say a _fatheaded_ fellow; _fat_ likewise means _gross_, and is sometimes used for _obscene_; and _fat_ is more congruent to _fulsome_ than _flat_."