Plural form of amphitheater; large oval or circular buildings with tiered seating surrounding a central area.
From Greek amphi- (both around) + theatron (theater/viewing place). Develops from ancient Roman architectural innovation.
The Colosseum holds 50,000 people but has no amplification—the amphitheater's geometry focuses sound perfectly, meaning a whispered conversation at the arena center could be heard in the top rows, making it an ancient engineering marvel.
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