pen·ta·gon (p n t -g n )n. 1. A polygon having five sides and five interior angles. 2. Pentagon A five-sided building near Washington, D.C., containing the U.S. Department of Defense and the offices of the U.S. Armed Forces. Used with the. [Late Latin pentag  num, from Greek pentagnon : penta-, penta- + -gnon, -gon.]pen·tag o·nal (pn-t g-nl) adj.pen·tag o·nal·ly adv. |   mathematical figure |
ThesaurusLegend: Synonyms Related Words Antonyms
| Adj. | 1. | pentagonal - of or relating to or shaped like a pentagon |
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