| Noun | 1.naut mi - a former British unit of length equivalent to 6,080 feet (1,853.184 meters); 800 feet longer than a statute mileAdmiralty mile, geographical mile, nautical mile, mi, milenautical linear unit - a linear unit of distance used in navigation | | 2.naut mi - a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitudeair mile, international nautical mile, mile, nautical mile, mi, knotnautical linear unit - a linear unit of distance used in navigation |