<p><strong>Noun</strong></p><ul><li>plural stadiums, stadia</li><li>a sports arena, usually oval or horseshoe-shaped, with tiers of seats for spectators</li><li>an ancient Greek course for foot races, typically semicircular, with tiers of seats for spectators</li><li>an ancient Greek and Roman unit of length, the Athenian unit being equal to about 607 feet (185 meters)</li><li>a stage in a process or in the life of an organism</li><li>Entomology. stage (def 11b)</li></ul>