Column

noun

1. A solid upright structure designed usually to support a larger structure above it, such as a roof or horizontal beam, but sometimes for decoration.
2. A vertical line of entries in a table, usually read from top to bottom.
3. A body of troops or army vehicles, usually strung out along a road.
4. A body of text meant to be read line by line, especially in printed material that has multiple adjacent such on a single page.

   "It was too hard to read the text across the whole page, so I split it into two columns."

5. A unit of width, especially of advertisements, in a periodical, equivalent to the width of a usual column of text.

   "Each column inch costs $300 a week; this ad is four columns by three inches, so will run $3600 a week."