Definition of pillars:
(n) :
(architecture) A large post, often used as supporting architecture.
(n) :
(figuratively) An essential part of something that provides support.
(n) :
Something resembling such a structure.
(v) :
(transitive) To provide with pillars or added strength as if from pillars.
(n) :
The centre of the volta, ring, or manege ground, around which a horse turns.
(n) :
(geology) A vertical, often spire-shaped, natural rock formation.