n.
1.a line of (usually military) units following one after another
2.a vertical glass tube used in column chromatography
3.a linear array of numbers one above another
4.anything tall and thin approximating the shape of a column or tower
5.an article giving opinions or perspectives
6.a vertical structure standing alone and not supporting anything (as a monument or a column of air)
7.(architeture) a tall cylindrical vertical upright and used to support a structure