| pentagon | <geometry> 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. Origin: Gr.; (see Penta-) + gwnia angle: cf. L. Pentagonium, F. Pentagone. Source: Websters Dictionary (01 Mar 1998) |
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| pentagon | a government building with five sides that serves as the headquarters of the United States Department of Defense |
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| pentagon | the United States military establishment |
| pentagon | a five-sided polygon |
| pentagon | of or relating to or shaped like a pentagon |
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