Source : Webster's Revised Unabridged Dictionary (1913)

Mile \Mile\, n. [AS. m[=i]l, fr. L. millia, milia; pl. of mille
   a thousand, i. e., milia passuum a thousand paces. Cf. {Mill}
   the tenth of a cent, {Million}.]
   A certain measure of distance, being equivalent in England
   and the United States to 320 poles or rods, or 5,280 feet.

   Note: The distance called a mile varies greatly in different
         countries. Its length in yards is, in Norway, 12,182;
         in Brunswick, 11,816; in Sweden, 11,660; in Hungary,
         9,139; in Switzerland, 8,548; in Austria, 8,297; in
         Prussia, 8,238; in Poland, 8,100; in Italy, 2,025; in
         England and the United States, 1,760; in Spain, 1,552;
         in the Netherlands, 1,094.

   {Geographical}, or {Nautical mile}, one sixtieth of a degree
      of a great circle of the earth, or 6080.27 feet.

   {Mile run}. Same as {Train mile}. See under {Train}.

   {Roman mile}, a thousand paces, equal to 1,614 yards English
      measure.

   {Statute mile}, a mile conforming to statute, that is, in
      England and the United States, a mile of 5,280 feet, as
      distinguished from any other mile.

Source : WordNet®

nautical mile
     n 1: a British unit of length equivalent to 1,853.18 meters
          (6,082 feet) [syn: {naut mi}, {mile}, {mi}, {geographical
          mile}, {Admiralty mile}]
     2: a unit of length used in navigation; equivalent to the
        distance spanned by one minute of arc in latitude; 1,852
        meters [syn: {mile}, {mi}, {naut mi}, {knot}, {international
        nautical mile}, {air mile}]