A Column

1. (architecture) 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.
5. A unit of width, especially of advertisements, in a periodical, equivalent to the width of a usual column of text.
6. (by extension) A recurring feature in a periodical, especially an opinion piece, especially by a single author or small rotating group of authors, or on a single theme.
7. Something having similar vertical form or structure to the things mentioned above, such as a spinal column.
8. (botany) The gynostemium
9. (chemistry) An object used to separate the different components of a liquid or to purify chemical compounds.

(upright structure): post, pillar, sile

(line of table entries): row (which is horizontal)