Meaning of “octagon” in the English Dictionary

"octagon" in British English

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(Definition of “octagon” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"octagon" in American English

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octagonnoun [ C ]

us /ˈɑk·təˌɡɑn/

geometry a flat shape with eight straight sides and eight angles

adjective [ not gradable ] us /ɑkˈtæɡ·ə·nəl/

(Definition of “octagon” from the Cambridge Academic Content Dictionary © Cambridge University Press)