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Pentagon

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pen⋅ta⋅gon

  [pen-tuh-gon]
Use Pentagon in a Sentence
–noun
1. a polygon having five angles and five sides.
2. the Pentagon,
a. a building in Arlington, Virginia, having a plan in the form of a regular pentagon, containing most U.S. Defense Department offices.
b. the U.S. Department of Defense; the U.S. military establishment.
Origin:
1560–70; < LL pentagōnum < Gk pentágōnon, n. use of neut. of pentágōnos five-angled. See penta-, -gon

Related forms:
pen⋅tag⋅o⋅nal  [pen-tag-uh-nl] , adjective
pen⋅tag⋅o⋅nal⋅ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pen·ta·gon   (pěn'tə-gŏn')   


(click for larger image in new window)
n.  

  1. A polygon having five sides and five interior angles.

  2. Pentagon A five-sided building near Washington, D.C., containing the U.S. Department of Defense and the offices of the U.S. Armed Forces. Used with the.


[Late Latin pentagōnum, from Greek pentagōnon : penta-, penta- + -gōnon, -gon.]
pen·tag'o·nal (pěn-tāg'ə-nəl) adj., pen·tag'o·nal·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
pentagon   (pěn'tə-gŏn')  Pronunciation Key 
A polygon having five sides.

pentagonal adjective (pěn-tāg'ə-nəl)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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