noun

• (music) A syllable used in sol-fa (solfège) to represent the third note of a major scale.
• Alternative form of mi. .
• Abbreviation of Michigan, a state of the United States of America. [A state of the United States.]
• Initialism of middle initial.
• (military) Initialism of military intelligence.
• (cardiology) Initialism of myocardial infarction. [(cardiology, pathology) Necrosis of heart muscle caused by an interruption to the supply of blood to the heart, often as a result of coronary thrombosis.]
• (cardiology) Initialism of mitral insufficiency.
• (dentistry) Initialism of mesioincisal.
• (mathematics) Initialism of mathematical induction. [(mathematics) A method of proof which, in terms of a predicate P, could be stated as: if P(0) is true and if for any natural number n>0, P(n) implies P(n+1), then P(n) is true for any natural number n.]
• (medicine) Initialism of mechanical index.
• (medicine) Initialism of medical inspection.
• (information theory) Initialism of mutual information. [(information theory) A measure of the entropic (informational) correlation between two random variables.]
• (baseball) Initialism of middle infielder. [(baseball) A player whose fielding position is in the middle infield (the second baseman and shortstop).]