Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A polygon with five sides and five angles.
  • noun A five-sided building near Washington DC, containing the US Department of Defense and the offices of the US Armed Forces. Used with the.

from The Century Dictionary.

  • noun In geometry, a figure of five sides and five angles: if all the sides and all the angles are equal it is a regular pentagon.
  • noun In fortification, a fort with five bastions.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom.) A plane figure having five angles, and, consequently, five sides; any figure having five angles.
  • noun a pentagon in which the angles are all equal, and the sides all equal.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geometry A polygon with five sides and five angles.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the United States military establishment
  • noun a five-sided polygon
  • noun a government building with five sides that serves as the headquarters of the United States Department of Defense

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Late Latin pentagōnium, from Greek pentagōnon, from neuter of pentagōnos, pentagonal : penta-, penta- + -gōnos, angled; see –gon.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From French pentagone or late Latin pentagonum, from Ancient Greek πεντάγωνον, noun use of the neuter of the adjective πεντάγωνος ("five-angled"), from πέντε ("five") + -γωνος ("angled").

Examples

Comments

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  • The U.S. Department of Defense.

    January 10, 2008

  • Also a surprisingly good (and old) cover band from central PA. I remember them saying on stage once, "Man, other bands get named after cattle diseases, and all we got was a building."

    August 2, 2008