Webster's English Dictionary

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pillar

1. pil.lar \'pil-*r\ n [ME piler, fr. OF, fr. ML pilare, fr. L pila] 1a: a 
   firm upright support for a superstructure : POST  1b: a column or shaft 
   standing alone esp. for a monument  2: a chief supporter : PROP  3: a solid 
   mass of coal, rock, or ore left standing to support a mine roof  4: a body 
   part likened to a column  : from one place or one situation to another  - 
   from pillar to post 
2. pillar vt : to support or strengthen with a pillar