Meaning of pentagon

pen•ta•gon

Pronunciation: (pen'tu-gon"), [key]
— n.
  1. a polygon having five angles and five sides.
    1. a building in Arlington, Virginia, having a plan in the form of a regular pentagon, containing most U.S. Defense Department offices.
    2. the U.S. Department of Defense; the U.S. military establishment.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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