nautical mile in WordNet English dictionary

1. a former British unit of length equivalent to 6,080 feet (1,853.184 meters); 800 feet longer than a statute mile
   nautical mile  naut mi  mile  mi  geographical mile  Admiralty mile 
   
2. a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude
   nautical mile  mile  mi  naut mi  knot  international nautical mile  air mile 
   

nautical mile in English Wiktionary