definition of
arena

[1] #1 arena n. [sphere, domain, area, orbit, field] 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". wn

[2] #2 arena n. the central area of an ancient Roman amphitheater where contests and spectacles were held; especially an area that was strewn with sand. wn

[3] #3 arena n. [stadium, bowl, sports stadium] a large structure for open-air sports or entertainments. wn

[4] #4 arena n. [scene of action] a playing field where sports events take place. wn