Arena (2009 film)
WordNet
noun
(1) A playing field where sports events take place
(2) A large structure for open-air sports or entertainments
(3) The central area of an ancient Roman amphitheater where contests and spectacles were held; especially an area that was strewn with sand
(4) 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"