noun

• (rail transport) The station code of Mahim Junction railway station in India.
• (chemistry) millimole, millimoles
• Abbreviation of month (in two-digit numeric format, as in: dd/mm/yyyy) [A period into which a year is divided, historically based on the phases of the moon.]
• (education) Initialism of Master of Music.
• (education) Initialism of Master of Management.
• (Freemasonry) Initialism of Master Mason.
• (amateur radio) Initialism of maritime mobile.
• (aviation) Initialism of middle marker. [(aviation) A type of marker beacon placed to indicate the missed approach point of a Category I ILS or IGS approach (typically the point at which the glideslope descends through 200 feet AGL), triggering a continuous visual and aural sequence of alternating Morse code dots and dashes from the marker beacon receiver in the cockpit of an aircraft flying over the marker.]
• Initialism of mile marker. [A numbered milepost or sign along a highway, or some other road, used to determine the location of a motor vehicle.]
• Initialism of man-month. [One person's working time for a month, or the equivalent, used as a measure of how much work or labor is required or consumed to perform some task.]
• (philately) Initialism of mounted mint.
• (finance) Abbreviation of million.
• (finance) Initialism of market maker. [(finance) A person or company that undertakes to quote both a buy and a sell price for a financial instrument.]
• (mathematics) Initialism of mathematical morphology. [(mathematics) A theory and technique for the analysis and processing of geometrical structures, based on set theory, lattice theory, topology, and random functions.]
• (numismatic slang) Initialism of mintmark. [An inscription stamped on a coin indicating the mint of origin.]
• (audio, electronics) Initialism of moving magnet, a type of phono cartridge.
• (video games) Initialism of Majora's Mask.