"arena" in the noun sense
1. sphere, domain, area, orbit, field, arena
a particular environment or walk of life
"his social sphere is limited"
"it was a closed area of employment"
"he's out of my orbit"
the central area of an ancient Roman amphitheater where contests and spectacles were held especially an area that was strewn with sand
3. stadium, bowl, arena, sports stadium
a large structure for open-air sports or entertainments
4. arena, scene of action
a playing field where sports events take place
Source: WordNet® (An amazing lexical database of English)
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