pentagon
/ˈpɛn.təˌɡɑn/
Proposed by a contributor, not yet supported by evidence.
Also seen as: pentagons
Sense 1
Meaning · English
A polygon with five sides and five angles.
Noun
Examples
Imagine a vast sheet of paper on which straight Lines, Triangles, Squares, Pentagons, Hexagons, and other figures, instead of remaining fixed in their places, move freely about, […]
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Sense 2
Meaning · English
A fort with five bastions.
Noun
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Common questions
What does “pentagon” mean?
A polygon with five sides and five angles.
Is “pentagon” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.