Miscellaneous
- Majority decision, a winning criterion in several full-contact combat sports
- Man-day, a unit of estimated work based on man-hours
- Materiali e discussioni per l'analisi dei testi classici, a classics journal
- Matthew Dent (designer), designer of the redesigned 2008 British coinage, whose initials can be seen embedded in most of the coins
- "Md.", a shortened version of the name Muhammad
- MD 20/20, a brand of fortified wine
- MDs (TV Series), a 2002 made-for-television medical drama
- Mega Drive, a console produced by Sega
- Metropolitan Division, a territory unit defined by the US Office of Management and Budget as a county or group of counties within a Metropolitan Statistical Area
- Missile Defense, a defensive weapon system intended to intercept incoming missiles
- Muscular Development, a bodybuilding magazine
- Infinite Challenge, also known as Muhan Dojeon, a South Korean comic-variety TV programme
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