a plane figure with five straight sides and five angles, the Pentagon: the headquarters of the US Department of Defense, near Washington DC

Formal and Informal Expressions of pentagon

In different contexts, you can replace 'pentagon' with suitable alternatives. In a more formal setting, 'five-sided figure' is apt. In informal speech or writing, 'shape with five sides' is a commonplace synonym.

pentagon: Explore its Definition & Usage

pentagon Definition

1a plane figure with five straight sides and five angles
2the Pentagon: the headquarters of the US Department of Defense, near Washington DC

Using pentagon: Examples

Take a moment to familiarize yourself with how "pentagon" can be used in various situations through the following examples!

Example
The stop sign has a pentagon shape.
Example
The building was designed in the shape of a pentagon.

pentagon Synonyms and Antonyms

Synonyms for pentagon

polygon
five-sided figure

Phrases with pentagon

regular pentagon
a pentagon with all sides and angles equal
Example
The logo is a regular pentagon with a star in the center.
irregular pentagon
a pentagon with sides and/or angles that are not equal
Example
The garden has an irregular pentagon shape due to the uneven terrain.
Pentagon Papers
a classified study of the Vietnam War that was leaked to the press in 1971, revealing government deception about the war
Example
The publication of the Pentagon Papers caused a political scandal.

Origins of pentagon

from Greek 'pente', meaning 'five', and 'gonia', meaning 'angle'

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Summary: pentagon in Brief

The term 'pentagon' [ˈpɛntəɡən] refers to a five-sided figure with five angles. It can be a regular or irregular polygon and is often used to describe shapes such as stop signs or buildings. The Pentagon, on the other hand, refers to the headquarters of the US Department of Defense.