Coloseums are large, oval-shaped amphitheaters that were used in ancient Rome for public events such as gladiator fights, chariot races, and theatrical performances. The term Coloseum is derived from the Latin word 'colosseus, ' meaning 'GIGANTIC.' STADIA, which is a six-letter crossword solution for Coloseums, is a Greek term meaning 'place for running' and was used to describe the large, open-air arenas used for athletic competitions in ancient Greece.