amphitheatre
noun
[ ˈamfɪθiːətə ]
• (especially in Greek and Roman architecture) an open circular or oval building with a central space surrounded by tiers of seats for spectators, for the presentation of dramatic or sporting events.
• "the opera was performed in the Roman amphitheatre"
Origin:
late Middle English: via Latin from Greek amphitheatron, from amphi ‘on both sides’ + theatron (see theatre).
