Definitions of coliseum
  1. noun
    an oval large stadium with tiers of seats; an arena in which contests and spectacles are held
    synonyms: amphitheater, amphitheatre
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    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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