Definitions of mi:

• noun:   the syllable naming the third (mediant) note of any major scale in solmization
• noun:   the government agency in the United Kingdom that is responsible for internal security and counterintelligence overseas
• noun:   the government agency in the United Kingdom that is responsible for internal security and counterintelligence on British territory
• noun:   a unit of length used in navigation; equivalent to the distance spanned by one minute of arc in latitude; 1,852 meters
• noun:   destruction of heart tissue resulting from obstruction of the blood supply to the heart muscle
• noun:   a midwestern state in north central United States in the Great Lakes region
• noun:   a British unit of length equivalent to 1,853.18 meters (6,082 feet)
• noun:   a unit of length equal to 1760 yards
• name:  A female given name (rare: 1 in 20000 females; popularity rank in the U.S.: #1384)