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Pillar (n.) The general and popular term for a firm, upright, insulated support for a superstructure; a pier, column, or post; also, a column or shaft not supporting a superstructure, as one erected for a monument or an ornament.
Pillar (n.) Figuratively, that which resembles such a pillar in appearance, character, or office; a supporter or mainstay; as, the Pillars of Hercules; a pillar of the state.
Pillar (n.) A portable ornamental column, formerly carried before a cardinal, as emblematic of his support to the church.
Pillar (n.) The center of the volta, ring, or manege ground, around which a horse turns.
Pillar (a.) Having a support in the form of a pillar, instead of legs; as, a pillar drill.