- 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.
- pentaerythritol tetranitrate,
- pentagon papers,
- pentagon, the,
- pentagonal dodecahedron,
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|Jacob Siegel|January 6, 2015|DAILY BEAST
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|DAILY BEAST
In rounders the bases are five in number and the field a pentagon in shape.Base-Ball|John M. Ward
Its Roman name was Anderida, the walls enclosing an irregular oval, the castle within being a pentagon, with towers at the angles.England, Picturesque and Descriptive|Joel Cook
Apparently he got his communication from the Pentagon about the time I got mine.Sense from Thought Divide|Mark Irvin Clifton
Pentagon -um: a five-sided figure with five equal or unequal angles.Explanation of Terms Used in Entomology|John. B. Smith
Can you fold a square piece of paper in such a way that with a single fold it forms a pentagon?My Discovery of England|Stephen Leacock
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.