arena

noun4

1. •
   An enclosed area, often outdoor, for the presentation of sporting events (sports arena) or other spectacular events; earthen area, often oval, specifically for rodeos (North America) or circular area for bullfights (especially Hispanic America).

   • A large crowd filled the seats of the arena.
2. •
   The building housing such an area; specifically, a very large, often round building, often topped with a dome, designated for indoor sporting or other major events, such as concerts.

   • The arena is grey with white beams.
3. •
   (historical) The sand-covered centre of an amphitheatre where contests were held in Ancient Rome.

   • The gladiators entered the arena.
4. •
   A realm in which events take place; an area of interest, study, behaviour, etc.

   • The company was a player in the maritime insurance arena.