WordWeb Online

1. A particular environment or walk of life
   "his social arena is limited";
   - sphere, domain, area, orbit, field
    
2. The central area of an ancient Roman amphitheatre where contests and spectacles were held; especially an area that was strewn with sand
    
3. A large structure for open-air sports or entertainments
   - stadium, bowl, sports stadium
    
4. A playing field where sports events take place
   - scene of action

Derived forms: arenas

Type of: area, athletic field, construction, country, environment, field, pitch [Brit], playing area, playing field, structure

Encyclopedia: Arena, Saskatchewan