3 definitions found From WordNet (r) 2.0 [wn]: Pentagon noun 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 From The Collaborative International Dictionary of English v.0.44 [gcide]: Pentagon \Pen"ta*gon\, noun [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. From U.S. Gazetteer (1990) [gazetteer]: Pentagon, DC Zip code(s): 20301

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