an upright shaft or structure, of stone, brick, or other material, relatively slender in proportion to its height, and of any shape in section, used as a building support, or standing alone, as for a monument: Gothic pillars; a pillar to commemorate Columbus.
2.
a natural formation resembling such a construction: a pillar of rock; a pillar of smoke.
3.
any upright, supporting part; post: the pillar of a table.
4.
a person who is a chief supporter of a society, state, institution, etc.: a pillar of the community.
5.
Horology. any of several short parts for spacing and keeping in the proper relative positions two plates holding the bearings of a watch or clock movement.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
early 13c., from O.Fr. piler, from M.L. pilare, from L. pila "pillar, stone barrier." Figurative sense of "prop or support of an institution or community" is first recorded early 14c. Phrase pillar to post is c.1600, originally of tennis, exact meaning obscure.