Also found in: Dictionary, Thesaurus, Acronyms, Wikipedia.

Pentagon, the

Pentagon, the, building accommodating the U.S. Dept. of Defense. Located in Arlington, Va., across the Potomac River from Washington, D.C., the Pentagon is a vast five-sided building designed by Los Angeles architect G. Edwin Bergstrom. It consists of five concentric pentagons connected to each other by corridors and covering an area of 34 acres (13.8 hectares). Completed in 1943, it was intended to consolidate the various offices of the U.S. War Dept., now the Dept. of Defense. Extensive renovations (1994–2011) have modernized and replaced much of the original building. One side of the vast building was damaged by a terrorist attack (Sept. 11, 2001) in which a hijacked airplane was intentionally crashed into the Pentagon. As a result of the crash and subsequent fire 189 people were killed, including the passengers and crew of the jetliner. The attack was coordinated with a similar one on the twin towers of the World Trade Center.


See S. Vogel, The Pentagon: A History (2007).

The Columbia Electronic Encyclopedia™ Copyright © 2022, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the pentagonal building near Washington, D.C., in Virginia, that is the headquarters of the US Department of Defense. In the broad sense, the term refers to the US Department of Defense, which exercises an enormous influence on US policy.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A polygon with five sides.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


a polygon having five sides


1. the five-sided building in Arlington, Virginia, that houses the headquarters of the US Department of Defense
2. the military leadership of the US
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
More importantly, the Pentagon aims to provide access to consumers soon enough.
Pentagon spokesman Colonel Rob Manning said all mail received at the Pentagon's screening facility Monday was "placed under quarantine and poses no threat to Pentagon personnel."
Rob Manning as saying, "On Monday, the Pentagon Force Protection Agency detected a suspicious substance during mail screening at the Pentagon's remote screening facility."
Yet, the Pentagon official minced no words in stressing how Washington wants to rebuild its relationship with Islamabad.
Critics have argued that a parade could cost millions of dollars, at a time the Pentagon wants more stable funding for an overstretched military.
Where the Pentagon said the Pasdaran acted "unprofessionally," the Pasdaran said the Americans conducted themselves "unprofessionally."
Pentagon says the opportunities to expand its engineering skill set, as well as its exisitng tooling activities were the main areas of interest for the takeover.
Most of the properties of the regular pentagon have been known for centuries.
Other candidates being considered include Homeland Security Secretary Jeh Johnson, who previously served as the Pentagon's general counsel, according to several people close to the process.
Pentagon say that more than 200 cars have to go, so additional manufacturer discounts have been specially set aside especially for the event.
The Pentagon needs to get creative as it plans the weapons of the future, officials have said, and it needs private-sector help.
Pentagon is experiencing flood of excess inventory The Department of Defense is experiencing billions of dollars in excess parts, vehicles, weapons and other supplies, which will include material that soon will return from Afghanistan, experts say.

Full browser ?