noun circuit; space; inclosure.
2. circus ·noun a circular inclosure for the exhibition of feats of horsemanship, acrobatic displays, ·etc. also, the company of performers, with their equipage.
3. circus ·noun 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.