Answer: An Amphitheatre or Amphitheater refers to an open-air venue or building for spectator sports, concerts, rallies, or theatrical performances during the Roman Empire. These were large central performance spaces surrounded by ascending seating. Derived from the ancient Greek - Amphi-, meaning "around", or "on both sides" and Théatron, meaning "place for viewing" Roman amphitheaters were spread far and wide throughout the empire, and most Roman cities had even a small one. The most famous Roman Amphitheater is the Colosseum in Rome, completed by the Emperor Titus in A.D. 80.
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