|Origin:||flet 'inside of a house' (14-19 centuries) (influenced by FLAT1)|
flat2 S2 W3 [countable]
a place for people to live that consists of a set of rooms that are part of a larger building [= apartment]: ➔ granny flat
place to liveespecially British English
They have a flat in Crouch End.
a two-bedroom flat
The building was knocked down to make way for a block of flats (=a large building with many flats in it).
a tyre that does not have enough air inside [= flat tyre]:
tyreTTC especially American English
Damn, the car has a flat.
He stopped to change a flat.
a musical note that is one semitone lower than a particular note
the sign in written music that shows that a note is one semitone lower than a particular note [↪ sharp, natural]
an area of land that is at a low level, especially near water:
a pair of women's shoes with very low heels
flats[plural] American English
the flat part or flat side of something
7 British English
on ground that is level and does not slope