- a long, slender, vertical structure used to support a superstructure; column
- such a column standing alone as a monument
- anything like a pillar in form or function, as a formation of ore left standing as a support in a mine
- a person who is a main support of an institution, movement, etc.
Origin of pillarMiddle English piler from Old French from Vulgar Latin an unverified form pilare from Classical Latin pila, column
from pillar to post