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1560s, Medieval Latin name for the classical Amphitheatrum Flavium (begun c.70 C.E.), noun use of neuter of adjective colosseus "gigantic;" perhaps a reference to the colossal statue of Nero that long stood nearby (see colossus).
A great arena of ancient Rome, which seated fifty thousand. It is in ruins today, but its former glory can still be imagined.
Note: Some of the contests staged in the Colosseum were between gladiators, who fought with swords; some were between people and animals. The arena could even be flooded for mock sea battles.
Note: According to tradition, persecuted Christians were fed to lions in the Colosseum for the entertainment of the Romans. (See also bread and circuses.)