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n. 1. An oval or circular structure having tiers of seats rising gradually outward from a central open space or arena. 2. Geology A level area surrounded by upward sloping ground. 3. An upper, sloping gallery with seats for spectators, as in a theater or operating room. [Middle English amphitheatre, from Latin amphitheātrum, from Greek amphitheātron : amphi-, amphi- + theātron, theater; see THEATER.] am′phi·the·atric (-ătrĭk), am′phi·the·atri·cal adj. am′phi·the·atri·cal·ly adv. |
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