Pentagon - Definitions from Dictionary.com

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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.

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

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

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American Heritage Dictionary - Cite This Source - Share This

pen·ta·gon Audio Help (pěn'tə-gŏn') Pronunciation Key

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n.

A polygon having five sides and five interior angles.
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.

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

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

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

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

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.

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