1. Also called: international nautical mile, air mile
a unit of length, used esp in navigation, equivalent to the average length of a minute of latitude, and corresponding to a latitude of 45°, i.e. 1852 m (6076.12 ft)
2.
a former British unit of length equal to 1853.18 m (6080 ft), which was replaced by the international nautical mile in 1970