What does COLUMN mean?

noun

1. a line of 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 vertical array of numbers or other information“he added a column of numbers”
4. anything that approximates 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 cylindrical structure standing alone and not supporting anything (such as a monument)
7. (architecture) a tall vertical cylindrical structure standing upright and used to support a structure
8. a page or text that is vertically divided“the newspaper devoted several columns to the subject”