Pronunciation (US) (Canada) enPR: pĕn'təgän, IPA (key): /ˈpɛn.tə.ɡɑn/ (UK) enPR: pĕn'təgən or pĕn'təgŏn, IPA (key): /ˈpɛn.tə.ɡən/ or /ˈpɛn.tə.ɡɒn/ Audio (CA)(file) Hyphenation: pen‧ta‧gon Noun Singular pentagon Plural pentagons (countable) A pentagon (⬟) is a shape that has five sides. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads