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2 definitions found
 for Pentagon
From The Collaborative International Dictionary of English v.0.48 :

  Pentagon \Pen"ta*gon\, n. [Gr. penta`gwnon; penta- (see
     Penta-) + gwni`a angle: cf. L. pentagonium, F. pentagone.]
     A plane figure having five angles, and, consequently, five
     sides; any figure having five angles.
     [1913 Webster]
     Regular pentagon, a pentagon in which the angles are all
        equal, and the sides all equal.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: a government building with five sides that serves as the
           headquarters of the United States Department of Defense
      2: the United States military establishment
      3: a five-sided polygon

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