arena

1 a large room or building for enclosed public gatherings watched the hockey game in the new sports arena Synonyms amphitheater, hall, auditorium, garden, theater (or theatre)Related Words arena theater, music hall, odeum, playhouse, theater-in-the-round; ballroom; lyceum; chamber, house, senate; cafetorium

2 a region of activity, knowledge, or influence has a lot of influence in the local business arena Synonyms area, field, bailiwick, barony, business, circle, demesne, department, discipline, domain, element, fief, fiefdom, firmament, front, game, kingdom, line, precinct, province, realm, specialty, sphere, terrain, walkRelated Words frontier; study, subject; territory, turf; occupation, profession, pursuit, racket, vocation; ambit, amplitude, breadth, compass, confine, dimension(s), extent, ken, reach, scope, sweep, width; subfield, subspecialty