LSJ Gloss:μίλιονa Roman mile, milliariumDodson:μίλιονa Roman milea Roman mile, measuring 1478.5 meters or 5820.9 feet.
TBESG:μίλιονmile G:N-Na Roman mile, milliarium , = 1000 paces,= 8 stades, = 1680 yards, i. e. 80 yards less than our mile, [Refs 2nd c.BC], etc. (ML)
Thayer:1) a mile, among the Romans the distance of a thousand paces or eight stadia, about 1.5 km [somewhat less than our mile]