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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
pen·ta·gon    Audio Help   [pen-tuh-gon] Pronunciation Key
–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]

pen·tag·o·nal    Audio Help   [pen-tag-uh-nl] Pronunciation Key, adjective
pen·tag·o·nal·ly, adverb
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Encyclopædia Britannica, Inc.
Pentagon

To learn more about Pentagon visit Britannica.com

© 2008 Encyclopædia Britannica, Inc.
American Heritage Dictionary - Cite This Source - Share This
pen·ta·gon    Audio Help   (pěn'tə-gŏn')  Pronunciation Key 


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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.
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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Online Etymology Dictionary - Cite This Source - Share This
pentagon 
plane figure with five angles and five sides, 1570, from M.Fr. pentagone, from L.L. pentagonum "pentagon," from Gk. pentagonon, properly neut. of adj. pentagonos "five-angled," from pente "five" + gonia "angle" (see knee). The U.S. military headquarters Pentagon was completed 1942, so called for its shape; used allusively for "U.S. military leadership" from 1945.

Online Etymology Dictionary, © 2001 Douglas Harper
WordNet - Cite This Source - Share This
pentagon

noun
1. a government building with five sides that serves as the headquarters of the United States Department of Defense 
2. the United States military establishment 
3. a five-sided polygon 

WordNet® 3.0, © 2006 by Princeton University.
Kernerman English Multilingual Dictionary - Cite This Source - Share This
pentagon [ˈpentəgən, (American) -gon] noun
a 5-sided geometrical figure
Arabic: مُخَمَّس، شَكْل خُماسي
Chinese (Simplified): 五边形
Chinese (Traditional): 五邊形
Czech: pětiúhelník
Danish: femkant; pentagon
Dutch: vijfhoek
Estonian: viisnurk
Finnish: viisikulmio
French: pentagone
German: das Fünfeck
Greek: πεντάγωνο
Hungarian: ötszög
Icelandic: fimmhyrningur
Indonesian: segi lima
Italian: pentagono
Japanese: 5角形
Korean: 5각형
Latvian: piecstūris
Lithuanian: penkiakampis
Norwegian: femkant, pentagon
Polish: pięciokąt, pięciobok
Portuguese (Brazil): pentágono
Portuguese (Portugal): pentágono
Romanian: pentagon
Russian: пятиугольник
Slovak: päťuholník
Slovenian: peterokotnik
Spanish: pentágono
Swedish: femhörning, pentagon
Turkish: beşgen
Kernerman English Multilingual Dictionary, © 2000-2006 K Dictionaries Ltd.
The American Heritage Science Dictionary - Cite This Source - Share This
pentagon    Audio Help   (pěn'tə-gŏn')  Pronunciation Key 
A polygon having five sides.

pentagonal adjective (pěn-tāg'ə-nəl)
The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
Pentagon

An immense five-sided building in Virginia, just outside Washington, D.C., that serves as headquarters for the Department of Defense.

Note: The term is often used to refer to the Department of Defense or the military: “The Pentagon agreed today to submit the modified weapons plan to the president.”
Note: The Pentagon was severely damaged by the September 11 attacks.

[Chapter:] American Politics


The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
pentagon

A polygon having five sides.

Note: The Pentagon is a huge five-sided building near Washington, D.C., that contains offices of the Department of Defense.

[Chapter:] Physical Sciences and Mathematics


The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
U.S. Gazetteer - Cite This Source - Share This

Pentagon, DC Zip code(s): 20301

U.S. Gazetteer, U.S. Census Bureau
Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Pentagon

Five\, a. [OE. fif, five, AS. f[=i]f, f[=i]fe; akin to D. vijf, OS. f[=i]f, OHG. finf, funf, G. f["u]nf, Icel. fimm, Sw. & Sw. Dan. fem, Goth. fimf, Lith. penki, W. pump, OIr. c['o]ic, L. quinque, Gr. ?, [AE]ol. ?, Skr. pa?can. [root]303. Cf. Fifth, Cinque, Pentagon, Punch the drink, Quinary.] Four and one added; one more than four.

Five nations (Ethnol.), a confederacy of the Huron-Iroquois Indians, consisting of five tribes: Mohawks, Onondagas, Cayugas, Oneidas, and Senecas. They inhabited the region which is now the State of new York.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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