Col ‧ os ‧ se ‧ um, the /ˌkɒləˈsiːəm $ ˌkɑːl-/ BrE AmE ( also the Coliseum )
an ↑ amphitheatre (=large circular theatre without a roof) in Rome which was built during the first century AD and is now one of the most famous ancient Roman buildings. It is thought of especially as a place where fights involving ↑ gladiator s and wild animals were organized as a form of entertainment.