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(geometry, also attributively) A polygon with eight sides and eight angles. / (martial arts) Often in the form Octagon: the arena for mixed martial arts.

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octagon

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octagon

/ˈɒktəɡ(ə)n/

noun

The stop sign has an octagon shape.

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意味（1）

(geometry, also attributively) A polygon with eight sides and eight angles.

From the Circle deſcribe the Octagon, by taking half the Quadrant of the former for each Side of the latter. … [B]y conjoining theſe Points with ſtrait Lines agreeable to the Shape of the Octagon, the whole Work is completed.

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意味（2）

(martial arts) Often in the form Octagon: the arena for mixed martial arts.

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octagon

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octagon

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