estadioEtymologyFrom Portuguese estádio, from Latin stadium (“stadium, Roman stade”), from Ancient Greek στάδιον (stádion, “stadium for footraces, stadion”). Doublet of stade, stadium, and stadion.nounA traditional Portuguese unit of distance, variously equivalent to about 185.2, 231.5, or 257.2 m depending on the number of leagues per equatorial degree.