flat

If something is flat, it has a surface with no high places or low places.

Example: There are a lot of mountains, and very little flat land for farming.

A flat is a rented room or rooms in a building with other flats.

Example: Would you like to come back to my flat and watch TV?

A flat makes a note one semitone lower than a natural: it is shown by the symbol ♭.

To make something flat.