- a polygon having five angles and five sides.
- the Pentagon,
- a building in Arlington, Virginia, having a plan in the form of a regular pentagon, containing most U.S. Defense Department offices.
- the U.S. Department of Defense; the U.S. military establishment.
Origin of pentagon
Examples from the Web for pentagon
Pentagon leaders agree to a person that the U.S. war against ISIS is succeeding.
“I think it is important to say it is too soon to judge success or failure,” said Col. Steven Warren, a Pentagon spokesman.
Granted, James is in an office in the Pentagon, and not on the front lines.
The Pentagon said Faal served in the Air Force for seven years, during which time he became a U.S. citizen.The Shadowy U.S. Veteran Who Tried to Overthrow a Country
January 6, 2015
But the program is just six weeks long, the Pentagon admitted Monday.Pentagon Insider on New Plan to Fight ISIS: ‘Of Course It’s Not Enough’
Nancy A. Youssef
January 6, 2015
Apparently he got his communication from the Pentagon about the time I got mine.Sense from Thought Divide
Mark Irvin Clifton
The field within the pentagon is particularly rich in clusters.A Field Book of the Stars
William Tyler Olcott
We saw the first transmission of this from the tape at the Pentagon.The Machine That Saved The World
William Fitzgerald Jenkins
"Negative," said the voice from the Pentagon, irritatingly GI.
Don heard a gasp from the Pentagon—or it might have come from the White House.
- a polygon having five sides
- the five-sided building in Arlington, Virginia, that houses the headquarters of the US Department of Defense
- the military leadership of the US
Word Origin and History for pentagon
plane figure with five angles and five sides, 1560s, from Middle French pentagone or directly from Late Latin pentagonum "pentagon," from Greek pentagonon, noun use of neuter of adjective pentagonos "five-angled," from pente "five" (see five) + gonia "angle" (see knee (n.)). The U.S. military headquarters Pentagon was completed 1942, so called for its shape; used allusively for "U.S. military leadership" from 1945. Related: Pentagonal.
In nature, pentagonal symmetry is rare in inanimate forms. Packed soap bubbles seem to strive for it but never quite succeed, and there are no mineral crystals with true pentagonal structures. But pentagonal geometry is basic to many living things, from roses and forget-me-nots to sea urchins and starfish. [Robert Bringhurst, "The Elements of Typographic Style," 1992]
- A polygon having five sides.
A polygon having five sides.