The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Centesimo \Cen*tes"i*mo\ (s[e^]n"t[e^]s"[i^]*m[-o]), n.; pl.
   -mi (s[e^]n"t[e^]s"[i^]*m[=e]). [It. & Sp.]
   A copper coin of Italy and Spain equivalent to a centime.
   [1913 Webster]

WordNet (r) 3.0 (2006):

MI
    n 1: destruction of heart tissue resulting from obstruction of
         the blood supply to the heart muscle [syn: myocardial
         infarction, myocardial infarct, MI]
    2: a former British unit of length equivalent to 6,080 feet
       (1,853.184 meters); 800 feet longer than a statute mile [syn:
       nautical mile, naut mi, mile, mi, geographical
       mile, Admiralty mile]
    3: a unit of length used in navigation; exactly 1,852 meters;
       historically based on the distance spanned by one minute of
       arc in latitude [syn: nautical mile, mile, mi, naut
       mi, knot, international nautical mile, air mile]
    4: a unit of length equal to 1,760 yards or 5,280 feet; exactly
       1609.344 meters [syn: mile, statute mile, stat mi,
       land mile, international mile, mi]
    5: a midwestern state in north central United States in the
       Great Lakes region [syn: Michigan, Wolverine State,
       Great Lakes State, MI]
    6: the government agency in the United Kingdom that is
       responsible for internal security and counterintelligence on
       British territory [syn: Security Service, MI, 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, MI, Military
       Intelligence Section 6]
    8: the syllable naming the third (mediant) note of any major
       scale in solmization