- myocardial infarction, myocardial infarct, MI - destruction of heart tissue resulting from obstruction of the blood supply to the heart muscle
 --1 is a kind of infarct, infarction
 --1 is a part of heart attack
- nautical mile, naut mi, mile, mi, geographical mile, Admiralty mile - a British unit of length equivalent to 1,853.18 meters (6,082 feet)
 --2 is a kind of nautical linear unit
 
- nautical mile, mile, mi, naut mi, knot, international nautical mile, air mile - a unit of length used in navigation; equivalent to the distance spanned by one minute of arc in latitude; 1,852 meters
 --3 is a kind of nautical linear unit
 
- mile, statute mile, stat mi, land mile, mi - a unit of length equal to 1760 yards
 --4 is a kind of linear unit
 --4 is a part of league
 --4 has parts:furlong; half mile, 880 yards; quarter mile, 440 yards 
- Michigan, Wolverine State, Great Lakes State, MI - a midwestern state in north central United States in the Great Lakes region
 --5 is a kind of American state
 --5 is a part of Midwest, Middle West
 --5 has parts:
- Security Service, MI, Military Intelligence Section 5 - the government agency in the United Kingdom that is responsible for internal security and counterintelligence on British territory
 --6 is a kind of international intelligence agency
 
- Secret Intelligence Service, MI, Military Intelligence Section 6 - the government agency in the United Kingdom that is responsible for internal security and counterintelligence overseas
 --7 is a kind of international intelligence agency
 
- mi - the syllable naming the third (mediant) note of any major scale in solmization
 --8 is a kind of solfa syllable