An ancient Roman unit of length equivalent to 1620 yards WordNet 3.0 & Open English WordNet

An ancient Roman unit of itinerant distance of 1,000 paces (mille passus, hence also "mile" from Latin mille, "1,000"). Indirectly standardized to 5,000 Roman feet by Agrippa in 29 BC. In modern times, Agrippa's Imperial Roman mile is empirically estimated to have been around 1,481 meters (1,620 yards, 4,860 English feet, 0.92 English miles); compared with a modern mile, which is 5280 feet. Wiktionary

Roman unit of length. Wiktionary (translation)