pentagon

pentagon · noun¹

1. Ancient Greek · derived fromπεντάγωνον
2. Late Latin · derived frompentagōnum
3. Middle French · derived frompentagone
4. English todaypentagon

From Middle French pentagone, from Late Latin pentagōnum, from Ancient Greek πεντάγωνον (pentágōnon), noun use of the neuter of the adjective πεντάγωνος (pentágōnos, “five-angled”), from πέντε (pénte, “five”) + -γωνος (-gōnos, “angled”). Equivalent to penta- + -gon.

Pentagon · proper noun²

From the shape of the building.