A Pillar

1. (architecture) A large post, often used as supporting architecture.
2. Something resembling such a structure.
3. (figuratively) An essential part of something that provides support.
4. (Roman Catholicism) A portable ornamental column, formerly carried before a cardinal, as emblematic of his support to the church.
5. The centre of the volta, ring, or manege ground, around which a horse turns.

Synonyms

• column, sile