Circus /(?)/

pl. Circuses

1. 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. (Roman Antiq.)
2. A circular inclosure for the exhibition of feats of horsemanship, acrobatic displays, etc. Also, the company of performers, with their equipage.
3. Circuit; space; inclosure. [R.]

   The narrow circus of my dungeon wall.