1.a line of (usually military) units following one after another
2.a vertical glass tube used in column chromatography; a mixture is poured in the top and washed through a stationary substance where components of the mixture are adsorbed selectively to form colored bands
3.a linear array of numbers one above another
4.anything tall and thin approximating the shape of a column or tower;
the test tube held a column of white powder
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