pentagon

plural pentagons

1. geometryA polygon with five sides and five angles.

   Meronyms: angle, side; see also Thesaurus:polygon

   2 more examples

   Imagine a vast sheet of paper on which straight Lines, Triangles, Squares, Pentagons, Hexagons, and other figures, instead of remaining fixed in their places, move freely about, […]

   1884, A Square [pseudonym; Edwin A. Abbott], Flatland […] , London: Seeley & Co., Part I: This World, § 1.— Of the Nature of Flatland, page 3

   So if Colorado is not a rectangle, what is it? Well, not a pentagon, (Greek for 5-sider), hexagon (6-sider), or a heptagon (7-sider), but a—hold on to something—hexahectaenneacontakaiheptagon (697-sider).

   2023 January 23 [2018 October 31], Frank Jacobs, “Colorado Is Not a Rectangle—It Has 697 Sides”, in Big Think, archived from the original on 20 Apr 2023

   Synonyms: 5-gon, quinquangle

2. governmentA fort with five bastions.

1. The headquarters of the United States Department of Defense.
2. metonymicallyThe United States Department of Defense.

   Asked by CNN what measures DHS was taking after the Pentagon leaks, Mayorkas said the department issued a reminder to employees and that he had directed a review.

   2023 May 16, Priscilla Alvarez, “DHS directs review of personnel with access to classified material in wake of Pentagon leak”, in CNN

   1 more example

   The Vietnamese people inspired youth of all nationalities […] by demonstrating that the determination of a people to fight for their sovereignty and right to self-determination was an unconquerable force, even in the face of Pentagon might.

   2006 August 24, Leslie Feinberg, “Many histories converged at Stonewall”, in Workers World

   Synonyms: Pentagram