| 1. | an oval or round building with tiers of seats around a central open area, as those used in ancient Rome for gladiatorial contests. |
| 2. | any similar place for public contests, games, performances, exhibitions, etc.; an arena, stadium, or auditorium. |
| 3. | a room having tiers of seats arranged around a central area, in which students and other observers can view surgery, hear lectures, etc. |
| 4. | British.
|
| 5. | a level area of oval or circular shape surrounded by rising ground. |