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Definition of arena:

  1. Any place of public contest or exertion; any sphere of action; as, the arenaof debate; the arena of life.
  2. Sand or gravel in the kidneys.
  3. 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.

Synonyms:

force field, pipe bowl, sphere of influence, demesne, domain, welkin, field of honor, field of study, eye socket, knowledge domain, cranial orbit, vault of heaven, celestial sphere, coliseum, bowling ball, subject area, territory, line of business, knowledge base, discipline, firmament, playing area, scene, heavens, scene of action, surface area, course, field of operations, gridiron, athletic field, playing field, subject, bag, field of force, theater of operations, reach, theatre of operations, pit, park, scope, baseball field, compass, trough, field of battle, range, orbital cavity, battleground, sphere, celestial orbit, square, theatre, bowl, subject field, platform, expanse, domain of a function, electron orbit, bowlful, sports stadium, plain, landing field, football field, study, country, boxing ring, roll, orbit, airfield, department, field, terrain, ambit, champaign, field of view, empyrean, area, field of operation, world, stadium, gym, sector, flying field, land.

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