Pentagon

/pˈɛntəɡən/

/ˈpɛnɪˌɡɑn/, /ˈpɛntɪˌɡɑn/

Pentagon

(geometry) a polygon with five angles and five straight sides

a government building with five sides that serves as the headquarters of the United States Department of Defense

the United States military establishment

Examples

1. This one has twelve pentagons.

2. That prospect has unnerved Pentagon leaders.

3. 5-sided polygons are called pentagons.

4. They do sell pentagons.