amphitheater

amphitheater
Architecture. 1. an oval, circular, or semicircular auditorium with tiers of seats rising from a central open area.an oval, circular, or semicircular auditorium with tiers of seats rising from a central open area. 2. an outdoor theater in this style, especially in ancient Greece.an outdoor theater in this style, especially in ancient Greece. Geology. a landform suggesting an amphitheater, having a relatively flat floor surrounding by steeply sloping sides.