coliseum
US /ˌkɑː.ləˈsiː.əm/
UK /ˌkɑː.ləˈsiː.əm/
1.
an ancient amphitheater in Rome, Italy, famous for gladiatorial contests and public spectacles
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The ancient Coliseum is a must-see attraction in Rome.
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Gladiators once fought bravely in the Coliseum.
2.
a large amphitheater or stadium
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The concert was held at the city's new coliseum.
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Thousands of fans gathered at the coliseum for the championship game.