- The area in the central part of an amphitheater, in which
the gladiators fought and other shows were exhibited; -- so called
because it was covered with sand. - Any place of public contest or exertion; any sphere of
action; as, the arenaof debate; the arena of life. - "Sand" or "gravel" in the kidneys.
Meaning of 'arena' (Princeton's WordNet)
1 . arena
[ n]
Meaning (1): - a particular environment or walk of life