Meaning

noun destruction of heart tissue resulting from obstruction of the blood supply to the heart muscle

noun a former British unit of length equivalent to 6,080 feet (1,853.184 meters); 800 feet longer than a statute mile

noun a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude

originFrom Glover's solmization, from Middle English mi (“third degree or note of Guido of Arezzo's hexachordal scales”), Italian mi in the solmization of Guido of Arezzo, from the first syllable of Latin mīra (“miracles; the miraculous”) in the lyrics of the scale-ascending hymn Ut queant laxis by Paulus Deacon.

Etymology from Wiktionary, CC BY-SA 3.0