MD

MD (or MD. , M.D. , md, .md, md. ) stands for:

Majority Decision, judgement in boxing (majority decision)
Meteorological Service of the German Democratic Republic (until 1990), see weather service
Mixed area Village area in land use and development plans
Mediterranean Dialogue
Middle German, see Middle German language (abbreviation md. )
Ministry of Defence of East Timor

City and country codes:

Magdeburg, designation on small watercraft in the area of the Waterways and Shipping Authority Magdeburg
Maryland, US state, postal abbreviation
Republic of Moldova by ISO country code
Top-level domain (Internet) of the Republic of Moldova, see .md
Dominican Republic by ICAO code
License plate

Professional and Official Titles:

Managing Director
marketing director
Medical Doctor (English) for the professional title "physician" (abbreviation "MD" or "M.D."), see Doctor of Medicine#United States of America.
Medicinæ Doctor (engl.), also title designation for doctor of medicine (abbreviation M.D./MD as above), but research doctorate (requires scientific doctoral thesis similar to the German Doktorarbeit), mainly United Kingdom
Medizinaldirektor, rank for civil servant physicians, for example in the police, see Official titles of the German police#Polizeiärztlicher Dienst
Ministerialdirektor, title of a civil servant
Intermediate civil service, career in the civil service
Museum education service
Music director, title of a civil servant musician; usually the responsible arranger, leader and/or beat-setter of a band.

Science, mathematics, technology:

MD, Roman numeral 1500 (M=1000 + D=500), see Roman numerals
Machine Direction, running direction or preferred direction, for example of film or paper
File name extension of Markdown files (.md)
mean absolute deviation from the arithmetic mean
Membrane distillation
Mendelevium, chemical element
Message Digest, group of cryptographic protocols as application of a hash function for texts, among others MD5
Mic Dubbed, overwriting of a digital sound recording via microphone (opposite of Line Dubbed)
Microdrive (hard disk), memory card for card reader
Mini-DIN, family of connectors
MiniDisc, digital, opto-magnetic storage medium, mainly used for storing music
Mini-Disk, digital, mechanical storage medium (historical)
Molecular dynamics, numerical method, e.g. for computer simulation of fluids
Multiple Devices, Linux device drivers for RAID arrays

Medicine:

Company and products: