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Definition of pentagon

pentagon

/ˈpɛn.tə.ɡɑːn/
pen · ta · gon
Adverb:pentagonally
•
Plural:pentagons
•
Adjective:pentagonal
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pentagon Lexical Profile

pentagon Game Scores & Validity

• noun

1

A flat geometric figure or polygon with five straight sides and five interior angles.

Example

"The standard pattern on a classic soccer ball consists of black pentagons surrounded by white hexagons."

2

American The massive five-sided headquarters building of the United States Department of Defense in Arlington County, Virginia, or by metonymy, the U.S. defense leadership itself (usually capitalized as 'the Pentagon').

Example

"Journalists gathered in the briefing room at the Pentagon to hear the latest update on international disaster relief efforts."

• Nearby Words

pensiveness
penstemon
pent
pentagon
pentagonal
pentagram
pentameter

Word Origin & Etymology

Borrowed in the late 16th century via Middle French or Late Latin from Ancient Greek 'pentagonon', a compound of 'pente' (five) and 'gonia' (angle or corner).

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Pentagon. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/pentagon
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