Definition of circus :
1. A circular inclosure for the exhibition of feats of horsemanship, acrobatic displays, etc. Also, the company of performers, with their equipage.
2. A level oblong space surrounded on three sides by seats of wood, earth, or stone, rising in tiers one above another, and divided lengthwise through the middle by a barrier around which the track or course was laid out. It was used for chariot races, games, and public shows.
3. Circuit; space; inclosure.
arena (part of speech: noun)
hall, pen, amphitheater, precinct, ground, stage, courtyard, circuit, auditorium, dominion, hippodrome, domain, field, gallery, room, region, enclosure, beat, turf, theater, Colosseum, area, setting, arena, battle-ground, bailiwick, ring, gymnasium, realm, circle, campus, locale, battlefield, province
roundabout (part of speech: noun)
place (part of speech: noun)
- It's great to be a circus man, isn't it, Phil? - "The-Circus-Boys-Across-the-Continent-or-Winning-New-Laurels-on-the-Tanbark", Darlington, Edgar B. P..
- Maybe they escaped from a circus. - "The Turner Twins", Ralph Henry Barbour.
- " No." " Can't you see how a circus would jump at a chance to have these?" - "Youth", Isaac Asimov.