pil·lar (p?l??r)n.1. a. A slender, freestanding, vertical support; a column.b. Such a structure or one similar to it used for decoration.2. One who occupies a central or responsible position: a pillar of the state.tr.v. pil·lared, pil·lar·ing, pil·lars To support or decorate with pillars or a pillar.Idiom: from pillar to post From one place to another; hither and thither.[Middle English, from Old French pilier, from Medieval Latin p?l?re, from Latin p?la.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.pillar (?p?l?) n1. (Architecture) an upright structure of stone, brick, metal, etc, that supports a superstructure or is used for ornamentation2. something resembling this in shape or function: a pillar of stones; a pillar of smoke. 3. (Mountaineering) a tall, slender, usually sheer rock column, forming a separate top4. a prominent supporter: a pillar of the Church. 5. from pillar to post from one place to anothervb (Architecture) (tr) to support with or as if with pillars[C13: from Old French pilier, from Latin p?la; see pile1]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014pil?lar (?p?l ?r) n. 1. an upright shaft or structure, of stone, brick, or other material, relatively slender in proportion to its height, and of any shape in section, used as a building support, or standing alone, as for a monument. 2. a natural formation resembling such a construction: a pillar of smoke. 3. any upright, supporting part; post. 4. a person who is a chief supporter of a state, institution, etc. 5. (in a mine) an isolated mass of rock or ore, usu. serving as a roof support. v.t. 6. to provide or support with pillars. Idioms: from pillar to post, a. from place to place, esp. aimlessly. b. from one bad situation or predicament to another. [1175?1225; Middle English piler (