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1.
The pentagonal building serving as the headquarters of the US Department of Defense, near Washington, DC. The Pentagon's unique shape makes it a highly efficient office building. Although the Pentagon has 3,705,793 square feet (1,129,526 meters) of office space, it is possible to reach most points in the building within 10 minutes, a remarkable architectural achievement. In a building which coordinates the armed forces of the United States along with organizations responsible for intelligence and security, workers often need to be able to access each other quickly.
The idea of the Pentagon was conceived in 1941, when Brigadier General Brehon Sommervell was trying to solve the problem of limited space for the Department of Defense, a serious issue in the Second World War. It was agreed that a new building was needed, and a groundbreaking ceremony took place on 11 September, 1941. It took just two years to complete the building on former marshlands along the outskirts of Washington, and the Pentagon was quickly filled with communications equipment and staff to coordinate the Department of Defense.
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2.
1. Where Bush's monkeys sit and try to pronounce the names of the countrys they are bombing

2. A five sided shape with five corners

3. What wannabe Satanists draw on their walls, genitals and on the ground in white chalk
1. There's a mass without roofs. Let's bomb 'em!

2. This shape has five sides. Lets go for a walk and discuss the matter further

3. Nah, only joking. I'm not another member of the greedy society. Brothers
by The G November 21, 2003
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3.
The most down ass drinking group in the world. Members include The Dr., Your Royal Nastiness, Brando, Sleezy Lee, and 40 Hands. They have set out incredible records with beerpong and "stats."
"Ah shit the Pentagon's here? Hide the beer and the girls!"
by 40 Hands August 27, 2006
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4.
like being a square, but you are stupid 5 times in a row instead of 4.
Mike: Wow, what a square!
James: No, she's a pentagon, she has been way more stupid that.
by Cheesey Wackjob February 20, 2011
9 3
 
5.
1. The new airport which opened on 9/11
2. Shape with 5 sides
1. Flight 911 to the airport, we will be shortly landing.
2. WTF A PENTAGON HAX
by N. Gin September 12, 2010
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6.
*A shape with 5 corners.

*Another name for the USDoD, which is a massive, pentagon-shaped building (hence its name), which serves as the center for all national defense information, planning, coordinating, etc etc.
"Donald Rumsfeld is the Secretary of Defense. He's also bad-ass."
-me
by Dave September 09, 2004
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7.
When a girl is being ravished by 5 men simultaneously from all angles. The men find any opening possible for inercourse.
Krissy went to brooklyn and got pentagoned by a bunch of crazy boys after a mad wild rave.
by hazzzzz December 08, 2006
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