n. the government agency in the United Kingdom that is responsible for internal security and counterintelligence on British territoryn. a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latituden. a unit of length equal to 1,760 yards or 5,280 feet; exactly 1609.344 metersn. the syllable naming the third (mediant) note of any major scale in solmizationn. a former British unit of length equivalent to 6,080 feet (1,853.184 meters); 800 feet longer than a statute milen. the government agency in the United Kingdom that is responsible for internal security and counterintelligence overseasn. a midwestern state in north central United States in the Great Lakes regionn. destruction of heart tissue resulting from obstruction of the blood supply to the heart muscle