pentagon

1 of 2

noun (1)

pen·​ta·​gon ˈpen-tə-ˌgän 

: a polygon of five angles and five sides

Pentagon

2 of 2

noun (2)

: the U.S. military leadership

Examples of pentagon in a Sentence

Noun (1)

The general attended a meeting at the Pentagon.

There was disagreement between the President and the Pentagon over the new military budget.

Recent Examples on the Web

Noun

The model has evolved into a pentagon with five interconnected priorities. — Senthil Muthu, Forbes.com, 29 June 2026

Noun

The result is a soccer-ball-like shape composed of 20 hexagons and 12 pentagons. — Adam Kovac, Scientific American, 24 Apr. 2026

Pentagon officials estimate only 23% of 17- to 24-year-olds are eligible to serve. — Steven Beynon, ABC News, 15 Apr. 2026

Word History

Etymology

Noun (1)

Greek pentagōnon, from neuter of pentagōnos pentagonal, from penta- + gōnia angle — more at -gon

Noun (2)

the Pentagon building, headquarters of the Department of Defense

First Known Use

Noun (1)

1570, in the meaning defined above

Noun (2)

1945, in the meaning defined above

Phrases Containing pentagon

• the Pentagon

Rhymes for pentagon

• aileron
• antiphon
• autobahn
• carillon
• castellan
• celadon
• cephalon
• cynodon
• denouement
• deuteron
• echelon
• epsilon

Kids Definition

pentagon

noun

pen·​ta·​gon ˈpent-ə-ˌgän 

: a polygon of five angles and five sides