Definition of coliseum

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col·i·se·um also col·os·se·um    (kl-sm) KEY 

NOUN:

A large amphitheater for public sports events, entertainment, or assemblies.

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ETYMOLOGY:
Medieval Latin Colisum, an amphitheater in Rome, Italy, variant of Latin Colossum, from neuter of colossus, gigantic, from colossus, huge statue ; see colossus