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Longman Dictionary of Contemporary English
pentagon
noun
EXAMPLES FROM CORPUS
▪ A group of six pentagons folds naturally to form a serrated hemisphere.
▪ All the magic of the pentagon is transferred to this solid.
▪ Folding of square, pentagon, ellipse, spider and tetrahedron.
▪ For example, the square has four-fold symmetry, the pentagon has five-fold, the hexagon has six-fold symmetry.
▪ It is easy to see that there are 12 pentagons on the ball.
▪ The regular pentagon, in association with the hexagon, has been credited with magical powers throughout recorded history.
▪ They are completely regular solids: each has all of its faces repeating a regular polygon, triangle, square or pentagon.
▪ Two methods for construction of the regular pentagon.
The Collaborative International Dictionary
Pentagon

Pentagon \Pen"ta*gon\, n. [Gr. ?; ? (see Penta-) + gwni`a angle: cf. L. pentagonium, F. pentagone.] (Geom.) A plane figure having five angles, and, consequently, five sides; any figure having five angles.

Regular pentagon, a pentagon in which the angles are all equal, and the sides all equal.

Douglas Harper's Etymology Dictionary
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.\n\nIn 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]

Wiktionary
pentagon

n. (context geometry English) A polygon with five sides and five angles.

Wikipedia
Pentagon (disambiguation)

A pentagon is a five-sided polygon.

Pentagon may also refer to:

Pentagon (computer)

The Pentagon (Пентагон) home computer was a clone of the British-made Sinclair ZX Spectrum 128. It was manufactured by amateurs in the former Soviet Union, following freely distributable documentation. Its PCB was copied all over the ex-USSR in 1991-1996, which made it a widespread ZX Spectrum clone. The name "Pentagon" derives from the shape of the original PCB (Pentagon 48), with a diagonal cut in one of the corners.

Many simple devices (upgrades) were invented to connect to the Pentagon with a soldering iron.

Pentagon (novel)

Pentagon is a 1986 political novel by Allen Drury which follows the American military bureaucracy as it reacts to a crisis with the Soviet Union. It is a standalone work set in a different fictional timeline from Drury's 1959 novel Advise and Consent, which earned him a Pulitzer Prize for Fiction.

The novel was published in the United Kingdom as The Destiny Makers in 1988.

Pentagón

Pentagón is a Lucha Libre, or professional wrestling ring character also referred to as a gimmick that has been played by a number of different people over the years. The character was created as an Evil twin of professional wrestler Octagón and is always a rudo, or heel character (A character portraying the "bad guy" in wrestling.) The character was created by Asistencia Asesoría y Administración (AAA) owner Antonio Peña in 1995, giving AAA the rights to the name "Pentagón", which meant that when wrestlers who played Pentagón left AAA they had to modify the name such as "Pentagón Black". There have been at least three distinctive versions of Pentagón

Following the introduction of the Pentagón character Peña also introduced Pentagoncito, a Mini-Estrellas of Pentagón to act as the protagonist against the Mini-Estrella Octagoncito. There has been at least two diffent people under the Pentagoncito character. In 2012 AAA introduced Octagón, Jr., which led to the introduction of Pentagón Jr. a few months later.

Pentagon (TV series)

Pentagon, aka Pentagon Washington, is a public affairs TV series broadcast by the DuMont Television Network from May 6, 1951 to November 24, 1952. The series aired Sundays at 8:30pm ET.

Pentagon (J-rock Band)

Pentagon is a J-rock band formed in Autumn of 2014, members Chizuru and Minpha started the limited time band 'Call Me ...' as a two-member unit, with Taku on guitar and Atsuki on drums. After 13 December 2014, Atsuki and Taku became official members and Yutori was added to the band.

In February 2015, the band released their debut album titled Call me. On 29 April 2015 their debut single titled Shonen Waltz was released.

Pentagon (South Korean band)

Pentagon (; also stylized as PENTAGON or PTG) is an upcoming South Korean boy group formed by Cube Entertainment in 2016. The members are introduced through Mnet's survival show, Pentagon Maker.

Pentagon (Wiesbaden)

The Historical pentagon represents the historic core of the Hessian capital Wiesbaden.

It is bordered to the south of the Rheinstraße, to the west of the Schwalbacher Straße, north of the Röderstraße and Taunusstrasse and to the east of the Wilhelmstrasse. These roads form a pentagon enclosing the old town of Wiesbaden. The development outside this street line did not start until the second half of the 19th century.

The Rheinstraße (in front), Schwalbacher Straße (left), Röder- and Taunusstraße (top) and Wilhelmstraße (right) aref forming the Historical pentagon

Within the pentagon of the medieval city layout is located with many historic buildings, including the City Palace of the Dukes of Nassau on Schloßplatz and Old Town Hall and the oldest surviving building in the city dating from Roman times, the Heidenmauer (Wiesbaden) (pagan wall).

The Historical pentagon goes back to the year 1818, when the Wiesbaden city builder and architect Christian Zais presented first building plans and expert evidence for an urban extension in which this approach was adopted.

Usage examples of "pentagon".

States had been troubled by divers ill-intentioned persons pretending to have received revelations from another World, and professing to produce demonstrations whereby they had instigated to frenzy both themselves and others, it had been for this cause unanimously resolved by the Grand Council that on the first day of each millenary, special injunctions be sent to the Prefects in the several districts of Flatland, to make strict search for such misguided persons, and without formality of mathematical examination, to destroy all such as were Isosceles of any degree, to scourge and imprison any regular Triangle, to cause any Square or Pentagon to be sent to the district Asylum, and to arrest any one of higher rank, sending him straightway to the Capital to be examined and judged by the Council.

The choice of a pollster may not have the same global implications as picking the Pentagon boss, but the approach to decision-making is probably similar in both cases.

President was conducting a meeting in the Oval with Chancellor Schmeer and several high officials when a computer in the National Military Command Center at the Pentagon wrongly interpreted an ionospheric disturbance as a massive Soviet nuclear attack.

Khalid Shaikh Mohammed, who helped his nephew plan the strikes on the World Trade Center and the Pentagon.

And the fact that it could only be used part of the time and only for defense, a fatal flaw no doubt in the tired imaginations of the old incompetents at the Pentagon, was completely in accord with that essential, really primary Shastri vector: self-realization and the necessity for diverse answers in a society.

By the end of the first fortnight of December these works were finished, and Prospect Heights--that is to say, a sort of irregular pentagon, having a perimeter of nearly four miles, surrounded by a liquid belt--was completely protected from depredators of every description.

The aardwolf clearly caught the attention of the White House and Pentagon.

The fact that your President, at the eager prompting of the Chiefs of Staff, the entire Pentagon, the NSA and your own Director, have ordered us to rescue the airframe if we humanly can?

General Adamson, who has Colonel Albright with him, has probably left the Pentagon by now.

Pentagon, in the beflagged office of the omnipotent Secretary of Defense, a tiny man with a pinched face and a slightly askew toupee sat on three cushions behind an enormous desk and virtually spat into his telephone.

From these draw lines to point of sight, then by their aid and the two diagonals proceed to construct the pentagon in the same way that we did the triangles and other figures.

Images were all fakery and manipulation cobbled together by the evil gnomes of Ogle Data Research, who had their secret headquarters just a short distance away, in the mysterious place called Pentagon Towers.

Soon after arriving at the Pentagon, Rumsfeld met with General Hugh Shelton, the chairman of the Joint Chiefs of Staff, a former Special Operations Forces commander and an imposing physical presence.

Gingrich, the former House Speaker and Pentagon defense adviser who interacted with both Franks and Rumsfeld, described their relationship as fraught with creative tension.

December 1970 I had what turned out to be my next-to-last talk with Senator Fulbright, in his office, about what to do with the Pentagon Papers.