Source : Webster's Revised Unabridged Dictionary (1913)

Mi \Mi\, n. [It.] (Mus.)
   A syllable applied to the third tone of the scale of C, i.
   e., to E, in European solmization, but to the third tone of
   any scale in the American system.

Source : WordNet®

MI
     n 1: destruction of heart tissue resulting from obstruction of
          the blood supply to the heart muscle [syn: {myocardial
          infarction}, {myocardial infarct}]
     2: a British unit of length equivalent to 1,853.18 meters
        (6,082 feet) [syn: {nautical mile}, {naut mi}, {mile}, {geographical
        mile}, {Admiralty mile}]
     3: a unit of length used in navigation; equivalent to the
        distance spanned by one minute of arc in latitude; 1,852
        meters [syn: {nautical mile}, {mile}, {naut mi}, {knot}, {international
        nautical mile}, {air mile}]
     4: a unit of length equal to 1760 yards [syn: {mile}, {statute
        mile}, {stat mi}, {land mile}]
     5: a midwestern state in north central United States in the
        Great Lakes region [syn: {Michigan}, {Wolverine State}, {Great
        Lakes State}]
     6: the government agency in the United Kingdom that is
        responsible for internal security and counterintelligence
        on British territory [syn: {Security Service}, {Military
        Intelligence Section 5}]
     7: the government agency in the United Kingdom that is
        responsible for internal security and counterintelligence
        overseas [syn: {Secret Intelligence Service}, {Military
        Intelligence Section 6}]
     8: the syllable naming the third (mediant) note of any major
        scale in solmization