[n] a tall cylindrical vertical upright
[n] a vertical structure standing alone and not supporting anything (as a monument or a column of air)
[n] 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
[n] an article giving opinions or perspectives
[n] a line of (usually military) units following one after another
[n] a linear array of numbers one above another
[n] anything tall and thin approximating the shape of a column or tower; "the test tube held a column of white powder"; "a tower of dust rose above the horizon"; "a thin pillar of smoke betrayed their campsite"