n. The inclosed space in the central part of the Roman amphitheaters, in which the combats of gladiators or wild beasts took place.n. Figuratively, the scene or theater of exertion or contest of any kind: as, the arena of war or of debate.n. In pathology, sand or gravel in the kidneys.n. In architecture, the main area of a temple, church, or other building.n. Are not.