amphitheater

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am·phi·the·a·ter / ˈamfəˌ[unvoicedth]ēətər/ • n. (esp. in Greek and Roman architecture) a round building, typically unroofed, with a central space for the presentation of dramatic or sporting events. Tiers of seats surround the central space. ∎  a sloping, semicircular seating gallery: a lecture in the amphitheater of the hospital. ∎  a large circular hollow in rocks or hills.

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