(n.) An oval or circular building with rising tiers of seats about an open space arena\; Alt. of Amphitheatre

Elizabethan theater Globe Theatre Greek theater agora arena arena theater assembly hall athletic field auditorium background bear garden bowl boxing ring bull ring cabaret campus canvas chapel circle theater circus classroom club cockpit coliseum colosseum concert hall convention hall course dance hall exhibition hall field floor forum gallery ground gym gymnasium hall hippodrome house lecture hall lecture room lists little theater locale marketplace mat meetinghouse milieu music hall night spot nightclub open forum opera opera house outdoor theater palaestra parade ground pit place platform playhouse precinct prize ring public square purlieu range recitation room ring scene scene of action scenery schoolroom setting showboat site sphere squared circle stadium stage stage set stage setting terrain theater theater-in-the-round theatron tilting ground tiltyard walk wrestling ring