arena (
http://definr.com/arena)
n 1: 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" [syn:
sphere,
domain,
area,
orbit,
field]
2: the central area of an ancient Roman amphitheater where
contests and spectacles were held; especially a
sand-strewn area
3: a large structure for open-air sports or entertainments
[syn:
stadium,
bowl]
4: a playing field where sports events take place [syn: {scene
of action}]