American English

Definition of flat noun from the Oxford Advanced American Dictionary



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    in music
  1. 1[countable] a note played a half step lower than the note that is named. The written symbol is (♭) There are no sharps or flats in the key of C major. opposite sharp, natural
  2. tire
  3. 2[countable] a tire that has lost air, usually because of a hole We got a flat on the way home. We had to stop to change a flat.
  4. shoes
  5. 3flats [plural] shoes with a very low heel a pair of flats
  6. land
  7. 4[countable, usually plural] an area of low flat land, especially near water salt flats see also mudflat
  8. level part
  9. 5[singular] the flat of something the flat level part of something He beat on the door with the flat of his hand. the flat of a sword
  10. in theater
  11. 6[countable] (technology) a vertical section of scenery used on a theater stage
See the Oxford Advanced Learner's Dictionary entry: flat