(~s)
Note: The spelling 'premiss' is also used in British English for meaning 2.
1.
The ~s of a business or an institution are all the buildings and land that it occupies in one place.
There is a kitchen on the ~s...
The business moved to ~s in Brompton Road.
N-PLURAL: oft on the N
2.
A ~ is something that you suppose is true and that you use as a basis for developing an idea. (FORMAL)
The ~ is that schools will work harder to improve if they must compete...
= assumption
N-COUNT: oft N that