Definitions of coliseum

n an oval large stadium with tiers of seats; an arena in which contests and spectacles are held

amphitheater, amphitheatre
Amphitheatrum Flavium
a large amphitheater in Rome whose construction was begun by Vespasian about AD 75 or 80
Type of:
arena, bowl, sports stadium, stadium
a large structure for open-air sports or entertainments

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