(~s)
1.
A ~ is a tall solid structure, which is usually used to support part of a building.
...the ~s supporting the roof.
= column
N-COUNT
2.
If something is the ~ of a system or agreement, it is the most important part of it or what makes it strong and successful.
The ~ of her economic policy was keeping tight control over money supply.
N-COUNT: usu N of n
3.
If you describe someone as a ~ of society or as a ~ of the community, you approve of them because they play an important and active part in society or in the community.
My father had been a ~ of the community.
N-COUNT: N of n approval