octagon

noun

oc·​ta·​gon ˈäk-tə-ˌgän 

: a polygon of eight angles and eight sides

octagonal

äk-ˈta-gə-nᵊl 

adjective

octagonally

äk-ˈta-gə-nᵊl-ē 

adverb

Examples of octagon in a Sentence

Recent Examples on the Web

Goodall’s son, Simon, has also worked with the Ultimate Fighting Championship, dressing its octagons for events in Britain. — Chris McKenna, New York Times, 22 July 2026

Conor McGregor has finally revealed what exactly happened to his right knee during a very short return to the UFC octagon on July 11 in Las Vegas. — Scott Thompson, FOXNews.com, 20 July 2026

Fighters walked to the octagon from various rooms in the White House (including the Oval Office) onto the Truman Balcony, making for a dramatic entrances. — Alex Weprin, HollywoodReporter, 15 June 2026

Fighters made cinematic entrances out of the White House and into the octagon, flanked by first responders and veterans, even including a Medal of Honor recipient. — Kayla Hayempour, NBC news, 15 June 2026

Word History

Etymology

Latin octagonum, from Greek oktagōnon, from okta- + -gōnon -gon

First Known Use

1594, in the meaning defined above

Rhymes for octagon

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

Kids Definition

octagon

noun

oc·​ta·​gon ˈäk-tə-ˌgän 

: a polygon with eight angles and eight sides

octagonal

äk-ˈtag-ən-ᵊl 

adjective