(~s)
1.
A ~ is the horizontal surface that forms the top part or roof inside a room.
The rooms were spacious, with tall windows and high ~s...
The study was lined from floor to ~ on every wall with bookcases.
N-COUNT
2.
A ~ on something such as prices or wages is an official upper limit that cannot be broken.
...an informal agreement to put a ~ on salaries...
The agreement sets the ~ of twenty-two-point-five million barrels a day on OPEC production.
= limit
N-COUNT: oft N of n