[{"Bold_text": "noun", "List Items": ["a polygon having five angles and five sides.", "the Pentagon,a building in Arlington, Virginia, having a plan in the form of a regular pentagon, containing most U.S. Defense Department offices.the U.S. Department of Defense; the U.S. military establishment.", "a building in Arlington, Virginia, having a plan in the form of a regular pentagon, containing most U.S. Defense Department offices.", "the U.S. Department of Defense; the U.S. military establishment."]}]