• noun:   (architeture) a tall cylindrical vertical upright and used to support a structure
• noun:   a vertical structure standing alone and not supporting anything (as a monument or a column of air)
• noun:   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
• noun:   an article giving opinions or perspectives
• noun:   a line of (usually military) units following one after another
• noun:   a linear array of numbers one above another
• noun:   anything tall and thin approximating the shape of a column or tower

  Example: "The test tube held a column of white powder"

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