| 1. | 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. |
| 6. | Mining. an isolated mass of rock or ore in a mine, usually serving as a roof support in early operations and later removed, wholly or in part. |
| 7. | Nautical. mast 1 (def. 2). |
| 8. | to provide or support with pillars. |
| 9. | from pillar to post,
|
| 1. | Nautical.
|
| 2. | Also called pillar. the upright support of a jib crane. |
| 3. | any upright pole, as a support for an aerial, a post in certain cranes, etc. |
| 4. | to provide with a mast or masts. |
| 5. | before the mast, Nautical. as an unlicensed sailor: He served several years before the mast. |

pillar pil·lar (pĭl'ər)
n.
A structure or part that provides support and resembles a column or pillar.
Pillar
used to support a building (Judg. 16:26, 29); as a trophy or memorial (Gen. 28:18; 35:20; Ex. 24:4; 1 Sam. 15:12, A.V., "place," more correctly "monument," or "trophy of victory," as in 2 Sam. 18:18); of fire, by which the Divine Presence was manifested (Ex. 13:2). The "plain of the pillar" in Judg. 9:6 ought to be, as in the Revised Version, the "oak of the pillar", i.e., of the monument or stone set up by Joshua (24:26).