# List of acronyms: M

This list contains acronyms, initialisms, and pseudo-blends that begin with the letter M.
For the purposes of this list:
* acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars
* initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
* pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
    (a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome
    (i) = initialism, e.g.: CD – (i) compact disc
    (p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women
    (s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – megahertz)
Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P.
(Main list of acronyms)

## Contents

* Top
* M0–9 MA MB MC MD ME MF MG MH MI MJ MK ML MM MN MO MP MQ MR MS MT MU MV MW MX MY MZ
* m – (s) Metre – Milli
* M – (s) Mega- – One thousand (in Roman numerals)

## MA

* mA – (s) Milliampere
* Ma – (s) Megaannum
* MA
** (s) Madagascar (FIPS 10-4 country code)
** (i) Marijuana Anonymous
** (i) Master of Arts
** Massachusetts (postal symbol)
** Megaampere
** Morocco (ISO 3166 digram)
* MAA – (i) Mathematical Association of America
* MAAC – (a) Metro Atlantic Athletic Conference
* MAC
** (s) Macau (ISO 3166 trigram)
** (a) U.S. Military Airlift Command (1966–1992)
** Mid-American Conference
* MACA – (i) Military aid to the civil authorities
* MACE – (a) Multi-agent computing environment
* MACHO – (p) Massive compact halo object
* MAD
** (a) Magnetic anomaly detector
** (s) Moroccan dirham (ISO 4217 currency code)
** (a) Mutual assured destruction
* MADD
** (a) Mothers Against Drunk Driving
** Myoadenylate deaminase deficiency
** (p) Multiply–add
* MAF – (i) Maintenance action form
* MAFF - (a) Ministry of Agriculture, Forestry and Fisheries (various countries)
* MAGIC – (a) Major Atmospheric Gamma-ray Imaging Cherenkov (telescope)
* MAGNETAR – (p) Metaprogrammable AGent NETwork ARchitecture
* MAGTF – (i) Marine Air-Ground Task Force
* mah – (s) Marshallese language (ISO 639-2 code)
* Mahasz – (p) Magyar Hanglemezkiadók Szövetsége (Hungarian, "Association of Hungarian Record Companies")
* mal – (s) Malayalam language (ISO 639-2 code)
* MALD – (a) Miniature Air-Launched Decoy
* MANPADS – (p) MAN-portable air defence system
* MANPRINT – (p) Mapower and personnel integration
* MAO
** (i/a) Molėtų astronomijos observatorija (Molėtai Astronomical Observatory)
** (p) Monoamine oxidase
* MAOI – (p) Monoamine oxidase inhibitor
* MAP – (a) Management action plan (corporate phrase)
* MAPP - (a) Medical assistance premium program
* MAPS – (a) Monitoring Avian Productivity and Survivorship
* MAQS – (a) Museum of the American Quilter's Society ("max")
* mar – (s) Marathi language (ISO 639-2 code)
* MAR – (s) Morocco (ISO 3166 trigram)
* MarBEF – (p) Marine biodiversity and ecosystem functioning
* MARC
** (a) Machine readable cataloging (or machine readable code)
** Mailing list archive
** Maryland Area Regional Commuter train service
** Massachusetts Animal Rights Coalition
** Mid-America Regional Council
* MARCENT – (p) United States Marine Forces Central Command
* MARFORCC – (p) Marine Force Component Commander
* MARINE (acronym) Muscles Are Required, Intelligence Not Evaluated- Used by Enlisted and Officer Ranks in the USMC
* MARINES (acronym) My A** Rides In Navy Equipment, Sir! - Banter with Navy Personnel by Marines
* MARRS – (a) Martyn Young, Alex Ayuli, Rudy Tambala, Russell Smith, and Steve Young (British electronic music act)
* MAS – (i) NATO Military Agency for Standardization
* MASAS – (a) Monte Agliale Supernovae and Asteroid Survey
* Maser – (a) Microwave Amplification by Stimulated Emission of Radiation
* MASH – (a) Mobile Army Surgical Hospital
* MASINT – (p) Measurement And Signature Intelligence
* MATREX – (p) Modeling Architecture for Technology, Research & EXperimentation
* MATS – (a) U.S. Military Air Transport Service (1948–1966)
* MAVS – (a/i) Mobile Artillery Vehicle System
* MAW – (s) Malawi (IOC trigram, but not FIFA or ISO 3166)
* MAX – (i) Meta-reasoning Architecture for "X"

## MB

* MB
** (s) Manitoba (postal symbol)
** Martinique (FIPS 10-4 territory code)
** Medal of Bravery (Canada)
* MBA
** (i) Main Battle Area
** Main Belt Asteroid
** Master of Business Administration
* MBI – (i) Moody Bible Institute
* MBBL – (i) (U.S. Armor Center) Mounted Battlespace Battle Laboratory
* MBCC – (i) Migratory Bird Conservation Commission (U.S.)
* MBCS – (i) Multi-Byte Character Set
* MBE
** (p) Member of the Order of the British Empire
** (i) Multistate Bar Examination (U.S.)
* MBIDST – (i) Member of the British Institute of Dental and Surgical Technologists
* MBM – (i) Meat and Bone Meal
* MBR - (i) Master boot record
* MbS – (i) Mohammad bin Salman (current crown prince of Saudi Arabia)
* MBSE – (i) Model-based systems engineering
* mbsf – metres below sea floor, a depth convention used in paleontology and oceanography
* MBT – (i) Main Battle Tank
* MBTA – (i) Massachusetts Bay Transportation Authority – Migratory Bird Treaty Act (U.S.)
* MBTI – (i) Myers-Briggs Type Indicator

## MC

* mC – (s) Millicoulomb
* MC
** (s) Macau (FIPS 10-4 territory code)
** (i) Master of ceremonies
** (s) Megacoulomb
** (i) Military Cross (bravery award)
** (s) Monaco (ISO 3166 digram)
** (i) Mortar carrier
** (s) Eleven hundred (in Roman numerals)
* MCA
** (i) Master of Computer Applications
** Micro Channel Architecture
** Multichannel analyzer
** Music Corporation of America, the original name of the now-defunct MCA Inc.
** (i) Malaysian Chinese Association
* MCC
** (i) Marylebone Cricket Club
** Mission control center
** Motor control center
** Movement control centre
* MCD
** (i) Minimal Cerebral Dysfunction
** Minor civil division (U.S. Census term)
* MCDL – (i) Model Composition Definition Language
* MCFT – (i) Modified compression field theory
* MCG – (i) Melbourne Cricket Ground
* MC&G – (i) Mapping, charting, and geodesy
* MCI – (i) Microwave Communications, Inc.
* MCIS – (i) Mellon Collie and the Infinite Sadness
* MCM – (i) Mine Counter-Measures
* MCMV – (i) Mine Counter-Measure Vessel
* MCNC
** (i) Microelectronics Center of North Carolina
** (i) Mixing Condensation Nucleus Counter
* MCO
** (i) Major Combat Operation
** (s) Monaco (ISO 3166 trigram)
** (s) Orlando International Airport (IATA code)
** (i) Movement Control Officer
* MCP
** (i) Maintenance Collection Point
** Male Chauvinist Pig
* MCR – (i) My Chemical Romance
* MCSF – (i) Marine Corps Security Forces
* MCT – (i) Movement Control Team
* MCTIS – (i) Mounted Co-operative Target Identification System
* MCU
** (i) Marine Corps University
** Marvel Cinematic Universe
** Medium close-up (camera direction in British TV scripts)
** (p) Microcontroller unit
** (i) Milk clotting units
** Ming Chuan University
** Minimum coded unit (digital imaging)
** Multipoint control unit
** Municipal Credit Union (New York)
* MCWS – (i) Men's College World Series, the final phase of the NCAA Division I baseball tournament in the US

## MD

* Md – (s) Mendelevium
* MD
** (s) Fifteen Hundred (in Roman numerals)
** Maryland (postal symbol)
** (i) Medicinae Doctor (Doctor of Medicine/Medical Doctor)
** Mentioned in Dispatches (military)
** (s) Moldova (FIPS 10-4 country code; ISO 3166 digram)
* MDA
** (i) Main Defensive Action/Area
** (s) Moldova (ISO 3166 trigram)
** (i) Muscular Dystrophy Association
* MDF
** (i) Main distribution frame
** Medium-density fiberboard
* MDG
** (s) Madagascar (ISO 3166 trigram)
** (i) UN Millennium Development Goal
* MDL – (s) Moldovan leu (ISO 4217 currency code)
* MDM
** (i) Michigan Dartmouth MIT telescope consortium
** Master data management
* MDMA – (i) MethyleneDioxy-MethylAmphetamine (also known as "Ecstasy")
* MDNA – (p) Madonna's 12th studio album title (2012)
* MDO – (i) Membership Driven Organisation
* MDP – (i) Markov Decision Process
* MDT – (i) Mountain Daylight Time (UTC−6 hours)
* MDS
* MDV – (s) Maldives (ISO 3166 trigram)
* MDW
** (s) Chicago Midway International Airport in Chicago (IATA airport code)
** (i) Military District of Washington
** (s) Minnesota, Dakota and Western Railway (AAR reporting mark)
** (i) Mother’s Day Weekend

## ME

* Me – (s) Messerschmitt
* ME
** (s) Maine (postal symbol)
** (i) Mechanical engineer[ing]
** Medical examiner
** Middle East
** (s) Middle East Airlines (IATA code)
** (i) Memory Effect – Myalgic Encephalomyelitis
* MEA
** (i) Maine Educational Assessment
** Middle East Airlines
** Millennium Ecosystem Assessment
** Minimum en route altitude
** Mono-ethanol Amine
** Multilateral Environmental Agreement
* MEAC – (a) Mid-Eastern Athletic Conference (ME-ac)
* MEC
** (s) Maine Central Railroad
** Manta, Ecuador (IATA location identifier)
** (i) Model European Council
** Mountain East Conference
** Mountain Equipment Co-op
* MECC – (a) Minnesota Educational Computing Consortium (later Corporation, dissolved 1999)
* MECCA – (a) Milwaukee Exposition Convention Center and Arena, a former name for the sports venue now known as UW–Milwaukee Panther Arena
* MECO – (a) Main engine cutoff (NASA code for point in Space Shuttle ascent when three main engines are shut down prior to External Tank (ET) separation)
* MEDEVAC – (p) Medical evacuation
* MEDLI
** (a) Mars Science Laboratory Entry, Descent, and Landing Instrumentation
** (a) Medical & Scientific Libraries of Long Island
** (a) Model for Effluent Disposal using Land Irrigation
* MEDS – (a) Mission Essential Data Set
* MEF
** (i) U.S. Marine Expeditionary Force
** Minimum essential facility
** Mission essential force
* MEG – (i) MagnetoEncephaloGraphy
* MEI – (i) Matsushita Electric Industrial Co., Ltd.
* MEK
** (i) Magyar Elektronikus Konyvtar
** Message encryption key
** (a) methyl ethyl ketone
** (p) Mujahideen al-Khalq
* MEL
** (i) Maya Embedded Language
** Michigan Electronic Library
* MELT – (a) Metallic Line/Loop Test (ing)
* MEM
** (i) Message Exchange Mechanism
** (p) Microelectromechanical
* MEMS – (p) Microelectromechanical System
* MENA – (i/a) Middle East and North Africa ("MEE-na" or "MEH-na")
* MEO
** (a) Medium Earth orbit
** Most efficient organization
* MEP
** (i) Mechanical Electrical Plumbing
** Member of the European Parliament
** Missions étrangères de Paris (French for "Paris Foreign Missions")
** Model European Parliament
* MER – (i) Mars Exploration Rover
* MERL – (i) Mitsubishi Electric Research Laboratories
* MES
** (i) Marconi Electronic Systems
** Medium Edison screw
* MESSENGER – (p) MErcury Surface, Space ENvironment, GEochemistry and Ranging
* MET
** (p) Meteorological
** (a) Middle European Time
* METAR – (p) [Meteorological] Aviation Routine weather report
* METL – (i/a) Mission Essential Task List ("mettle")
* METOC – (p) Meteorological and Oceanographic
* METT-T – (a/i) Mission, Enemy, Terrain, Troops, and Time available (mnemonic)
* METT-TC – (a/i) Mission, Enemy, Terrain [and weather], Troops [and support], Time [available] and Civilian considerations (mnemonic)
* MEU
** (i) U.S. Marine Expeditionary Unit
** Maximum Expected Utility
* MeV – (s) Megaelectronvolt
* MEV
** (i) Medical Evacuation Vehicle
** Musica Elettronica Viva
* MEX – (s) Mexico (ISO 3166 trigram)
* MEZ – (i) Missile Engagement Zone
* MES – (a) Manufacturing Execution Systems

## MF

* mF – (s) Millifarad
* MF
** (s) Mayotte (FIPS 10-4 territory code)
** Megafarad
** (a) Motherf***er (profanity)
* MFG - (s) Manufacturing
* MFSB – (i) Mother, Father, Sister, Brother (1970s Philadelphia studio musicians collective)
* MFT
** (i) Managed file transfer
** Master File Table
** Mean field theory
** Media Foundation Transform
** Micro Four Thirds (camera design standard)

## MG

* mg – (s) Malagasy language (ISO 639-1 code) – Milligram
* Mg – (s) Magnesium – Megagram
* MG – (i) Machine Gun – (s) Madagascar (ISO 3166 digram) – (s) Major General – (s) Mongolia (FIPS 10-4 country code) – (i) Morris Garage
* MGA – (s) Malagasy ariary (ISO 4217 currency code)
* MGB – (i) Medium Girder Bridge, Motor Gun Boat
* MGM – (i) Metro Goldwyn Mayer – (s) Montgomery, Alabama (Airport Code)
* MGPAM – My Gym Partner's a Monkey
* MGS – (i) Mobile Gun System

## MH

* mh – (s) Marshallese language (ISO 639-1 code)
* mH – (s) Millihenry
* MH
** (s) Marshall Islands (postal symbol; ISO 3166 digram)
** Megahenry
** Montserrat (FIPS 10-4 territory code)
** (s) Malaysia Airlines (IATA code)
* MHC – (i) Major Histocompatibility Complex
* MHEV – Micro-Hybrid Electric Vehicle
* MHHW – (i) Mean Higher High Water (nautical charts)
* MHL – (s) Marshall Islands (ISO 3166 trigram)
* MHLW – (i) Mean Higher Low Water (nautical charts)
* MHRA – (i) (UK) Medicines and Healthcare products Regulatory Agency
* MHW – (i) Mean High Water (nautical charts)
* MHWN – (i) Mean High Water Neaps (nautical charts)
* MHWS – (i) Mean High Water Springs (nautical charts)
* MHz – (s) Megahertz

## MI

* mi – (s) Māori language (ISO 639-1 code)
* Mi – (s) Mebi
* MI
** (s) Malawi (FIPS 10-4 country code)
** Michigan (postal symbol)
** Midway Islands (ISO 3166 digram; obsolete 1986)
** (i) Military Intelligence
* MIA
** (i) Missing In Action
** Miami International Airport (IATA code)
* MIAA
** (i) Maryland Interscholastic Athletic Association
** Massachusetts Interscholastic Athletic Association
** Michigan Intercollegiate Athletic Association
** Mid-America Intercollegiate Athletics Association
* MIB
** (i) Men In Black
** Mint In Box (Internet auction/trading listings)
* MIC
** (i) Military Industrial Complex
** (i) Malaysian Indian Congress
* MICE – (a) Meetings, Incentives, Conferences, Exhibitions tourism
* MICLIC – (p) Mine Clearing Line Charge
* MICOM – (p) Missile Command
* MICV – (i) Mechanised Infantry Combat Vehicle
* MID – (s) Midway Islands (ISO 3166 trigram; obsolete 1986)
* MIDI – (a) Musical Instrument Digital Interface
* MIDAS – (a) Man-machine Integration Design and Analysis System
* MIDS – (i) Multi-Function Information Distribution System
* MIFC – (a) Military Industrial Financial Complex
* MIFG – (s) Shallow Fog (METAR Code)
* MIFPC – (a) Military Industrial Financial Pharmaceutical Complex
* MIKE – (a) Monitoring of Illegal Killing of Elephants
* MIL – (i) Man-In-the-Loop
* MIL-AASPEM – (i) Man-In-the-Loop AASPEM
* MILAN – (p) Missile d´infanterie léger antichar (French, "Anti-Tank Light Infantry Missile")
* MiLB – (p) Minor League Baseball
* MILC – (a) Mirrorless interchangeable-lens camera
* MILES – (a) Multiple Integrated Laser Engagement System (live combat simulation)
* MILF
** (i) Moro Islamic Liberation Front
** (a) Mother I'd Like to F**k
* MILSATCOM – (p) Military Satellite Communications
* MILSET – (a) Mouvement International pour le Loisir Scientifique Et Technique (French, "International Movement for Leisure Activities in Science and Technology")
* MILSTRIP – (p) Military Standard Requisitioning and Issue Procedure DLMSO MILSTRIP Manual
* Mimaropa – (p) Mindoro, Marinduque, Romblon, Palawan (a region in the Philippines)
* MIMOSA – (a) MIcroMeasurements Of Satellite Acceleration
* MIMPT – (i) Member of the Institute of Maxillofacial Prosthetists and Technologists
* MIP
** (a) Multilateral Interoperability Programme
** Multiple Identity Poster
* MIPC – (a) Military Industrial Pharmaceutical Complex
* MIRA – (a) MILAN Infra-Red Acquisition (thermal sight)
* MIRV – (a) Multiple Independent Reentry Vehicle
* MIS
** (a) Management Information Systems
** Museum Information System
* MISREP – (p) Mission Report
* MISSI – (a) Multilevel Information System Security Initiative
* MIT
** (i) Massachusetts Institute of Technology
** methylisothiazoline
** Milli Istihbarad Teskilati (Intelligence service of Turkey)
* MITL – (i) Man-In-The-Loop
* MITS – see entry

## MJ

* mJ – (s) Millijoule
* MJ
** (s) Megajoule
** (i) Michael Jordan
** (i) Michael Jackson
** (i) Mary Jane Watson (Spider-Man character)
* MJD – (i) Modified Julian Day
* MJF – (i) Maxwell Jacob Friedman, American professional wrestler (who currently performs as "MJF")
* MJP – (i) Military Judgement Panel

## MK

* mk – (s) Macedonian language (ISO 639-1 code)
* mK – (s) Millikelvin
* Mk - (s) Mark (US weapon designation), as in Mk 18 MOD 0 CQBR
* MK
** (s) Air Mauritius (IATA code)
** Macedonia (ISO 3166 digram; FIPS 10-4 country code)
** (i) Mandalskameratene (Norwegian football club)
** (s) Megakelvin
** (i) Milton Keynes
** Missionary Kids
** Mortal Kombat (1992 video game)
** Mortal Kombat (2011 video game)
* mkd – (s) Macedonian language (ISO 639-2 code)
* MKD
** (s) Macedonian denar (ISO 4217 currency code)
** North Macedonia (ISO 3166 trigram)
* MKG – (i) Michael Kidd-Gilchrist (American basketball player)
* MKO – (i) Mojahedin-e-Khalq Organization (Persian, "People's Mujahedin of Iran")
* MKS
** (i) Metre–Kilogram–Second (system of units)
** (p) MKS Inc. software company
* MKSA – (i) Metre–Kilogram–Second–Ampere (system of units)
* MKT
** (i) Missouri-Kansas-Texas Railroad (1865–1989)
** Mortal Kombat Trilogy
** Short form of Marketing

## ML

* ml – (s) Malayalam language (ISO 639-1 code)
* mL – (s) Millilitre
* ML
** (s) Mali (FIPS 10-4 country code; ISO 3166 digram)
** (i) Maximum Likelihood
** (s) Megalitre
* MLA
** (i) Martial Law Administration of Bangladesh
** Master of Landscape Architecture
** Medical Library Association
** Member of Legislative Assembly
** Modern Language Association
** Mutual legal assistance treaty
** Myelosis Leucemica Acuta
* MLB
** (i) Major League Baseball
** (s) Melbourne Orlando International Airport (IATA code)
* MLC – (i) Member of the Legislative Council (in India)
* MLE – (i) Maximum likelihood estimation
* mlg – (s) Malagasy language (ISO 639-2 code)
* MLG
** (i) Major League Gaming
** (i) Main Landing Gear
* MLHW – (i) Mean Lower High Water (nautical charts)
* MLI – (s) Mali (ISO 3166 trigram)
* MLK – (i) Martin Luther King Jr.
* MLL – (i) Major League Lacrosse
* MLLW – (i) Mean Lower Low Water (nautical charts)
* MLP – My Little Pony
* MLR
** (i) Medical Loss Ratio
* MLRS – (i) Multiple-Launch Rocket System
* MLS
** (i) Major League Soccer
** Multiple Listing Service
** Multilevel security
* MLSE
** (i) Maple Leaf Sports & Entertainment (owner of several Toronto-based sports teams)
** Maximum likelihood sequence estimation
* MLSR – (i) Missing, Lost or Stolen Report
* mlt – (s) Maltese language (ISO 639-2 code)
* MLT – (s) Malta (ISO 3166 trigram)
* MLVW – (i) Medium Logistics Vehicle, Wheeled
* MLW
** (i) Major League Wrestling (American professional wrestling promotion)
** Mean Low Water (nautical charts)
* MLWN – (i) Mean Low Water Neaps (nautical charts)
* MLWS – (i) Mean Low Water Springs (nautical charts)

## MM

* mm – (s) Millimetre
* Mm – (s) Megametre
* MM – (i) Military Medal – (s) Myanmar (ISO 3166 digram) – Two Thousand (in Roman numerals)
* MMA – (i) Mixed martial arts – Moving Mechanical Assembly
* MMC – (p) Machinist's Mate, Chief (USN rating) – (i) Materiel Management Centre
* MMCM – (p) Machinist's Mate, Master Chief (USN rating) – (i) Magnetic Mine Counter Measure
* MMCS – (p) Machinist's Mate, Senior Chief (USN rating)
* MMEV – (i) Multi-Mission Effects Vehicle
* MMI – (i) Man-Machine Interface
* MMI – (i) McLean Meditation Institute
* MMIC – (i) Mindfulness & Meditation Instructor, Certified
* MMIC – (i) McLean Meditation Institute Certified
* MMI – (i) Magical MonkeyZ Inc.
* MMIO – (i) Memory-mapped I/O
* MMK – (s) Burmese kyat (ISO 4217 currency code)
* MMO – (i) Massively Multiplayer Online (computer game)
* MMOR – (i) Master of Management in Operations Research
* MMORPG – (i) Massively multiplayer online role-playing game
* MMPR – Mighty Morphin Power Rangers
* MMR – (i) Measles, Mumps and Rubella vaccine – (s) Myanmar (ISO 3166 trigram)
* MMS – (i) Multimission Modular Spacecraft
* MMU – (i) Manchester Metropolitan University – (i) Manned Manoeuvring Unit
* MMW – (p) Millimetre Wave (radar, from "mm Wave")

## MN

* mn – (s) Mongolian language (ISO 639-1 code)
* mN – (s) Millinewton
* Mn – (s) Manganese
* MN – (s) Meganewton – Minnesota (postal symbol) – Monaco (FIPS 10-4 country code) – Mongolia (ISO 3166 digram)
* MNB – (p) Multinational Brigade
* MNB C – (p) Multinational Brigade Centre (KFOR)
* MND – (i) Motor Neurone Disease – (p) Multinational Division
* MNE – (s) Montenegro (ISO 3166 trigram)
* MNG – (i) Multiple-image Network Graphics – (s) Mongolia (ISO 3166 trigram)
* MNMF – (i) Multi-National Maritime Force
* MNP – (s) Northern Mariana Islands (ISO 3166 trigram)
* MNS – (i) Mission Needs Statement
* MNT – (p) Molecular nanotechnology – (s) Mongolian tugrik (ISO 4217 currency code)

## MO

* mo – (s) Moldovan language (ISO 639-1 code)
* Mo – (s) Molybdenum
* MO – (s) Macau (ISO 3166 digram) – (i) Medical Officer – (s) Missouri (postal symbol) – (i) modus operandi (Latin, "mode of operation") – (s) Morocco (FIPS 10-4 country code) [mutual oral]
* MOA – Museum of Art (Brigham Young University)
* MOAB – (a) Massive Ordnance Air Blast (official) – Mother Of All Bombs (slang)
* MOB – (i) Man Over Board – Marching Owl Band – Movable Object Block
* MOC – (i) Macedonian Orthodox Church – Measure Of Capability – Mission Operations Centre – My Own Creation (Lego)
* MOCAS – (a) Mechanization Of Contract Administration Services
* MoD – (i) Ministry of Defence (United Kingdom) and various other countries
* MOD – (i) Magneto-optical disc – Masters of Deception – Minimum Object Distance – Multiple Organ Dysfunction
* MoDAF – (p) Ministry of Defence Architecture Framework ("moh-daff")
* modem – (p) Modulator-Demodulator
* ModSAF – (p) Modular Semi-Automated Forces (military simulation)
* Moe – (a) Marvel of entertainment
* MOE – (i) Measure Of Effectiveness
* MOF – (a/i) Ministry of Finance (Japan)
* MOFA – (a/i) Ministry of Foreign Affairs (Japan)
* MOH – (a/i) Medal of Honor – Music On Hold
* MOID – (i) Minimum Orbital Intersection Distance
* MOJWA – (i) Movement for Oneness and Jihad in West Africa
* mol – (s) Moldovan language (ISO 639-2 code) – mole (unit)
* MOLO – (a) Mobile Other Licensed Operator (UK)
* MoM – (a) Multiple of the median
* MOM – (a) Message-oriented middleware
* MOM – (a) Master's Degree in Oriental medicine
* MoMA – (a) Museum of Modern Art (NYC)
* mon – (s) Mongolian language (ISO 639-2 code)
* MOND – (p) Modified Newtonian Dynamics
* MOO – (i) Measure Of Outcome
* MOOTW – (p) Military Operations Other Than War ("moot-double-you")
* MOP – (s) Macau pataca (ISO 4217 currency code) – (i) Measure Of Performance
* MOPE – (a) Ministry of Population and Environment (Nepal) – Most Oppressed People Ever (politics)
* MOPP – (i/a) Mission-Oriented Protective Posture
* MORP – (a) Meteorite Observation and Recovery Project
* MORS – (i) Military Operations Research Society
* MOS – (i) Military Occupational Specialty – (a) Mit Out Sound / Motor Only Sync – (i) Mobile Object System – Model Output Statistics – Multiplayer Online Services - (a) Mean Opinion Score
* MOS-CQ - (a) Mean Opinion Score - Conversational Quality (ITU-T P.800.1)
* MOS-LQ - (a) Mean Opinion Score - Listening Quality (ITU-T P.800.1)
* MOSFET – (a) Metal-Oxide-Semiconductor Field-Effect Transistor
* MOSS – (p) MObile Submarine Simulator – (a) Moving Object Support System
* MOT – (i) Ministry of Transport (UK)
* MOTA – (i) Member of the Orthodontic Technicians Association
* MOTESS – (a) Moving Object and Transient Event Search System
* MOTO – (a) Mail Order / Telephone Order – Master of the obvious
* MOU – (i) Memorandum Of Understanding
* MOUT – (i) Military Operations in Urban[ized] Terrain
* MOVES – (a) Modeling, Virtual Environments, and Simulation Institute
* MOW – (i) Maintenance of way (also MW)
* MOZ – (s) Mozambique (ISO 3166 trigram)

## MP

* MP – (i) Magic points – (s) Mauritius (FIPS 10-4 country code) – (i) Member of Parliament – Military Police – Missouri Pacific – (s) Northern Mariana Islands (postal symbol; ISO 3166 digram)
* mPa – (s) Millipascal
* MPa – (s) Megapascal
* MPA - Master of Public Administration
* MPA – (i) Maritime Patrol Aircraft
* MPAA – (i) Motion Picture Association of America
* MPC – (i) Minor Planet Center – Minor Planet Circular
* MPC – (i) Military Payment Certificate
* MPEC – (i) Minor Planet Electronic Circular
* MPEG – (a) Motion Pictures (Coding) Experts Group
* MPEV – (i) Multi-Purpose Engineering Vehicle
* MPF – (i) Maritime Prepositioning Force
* MPFC – (i) Medial PreFrontal Cortex
* MPG - (i) Miles Per Gallon
* MPMC – (i) Medial PreMotor Cortex
* MPSI – (i) Member of the Pharmaceutical Society of Ireland
* MPSoC – (i) MultiProcessor System-on-Chip
* MPSRON – (p) Maritime Propositioning Ship Squadron

## MQ

* MQ
** (s) Martinique (ISO 3166 digram) – Midway Islands (FIPS 10-4 territory code)
** (s) Multi-mission Unmanned Aerial Vehicle (US tri-service aircraft designator)

## MR

* mr – (s) Marathi language (ISO 639-1 code)
* MR – (s) Mauritania (FIPS 10-4 country code; ISO 3166 digram)
** (i) Model Railroader Magazine
* MR-ATGW – (i) Medium-Range Anti-Tank Guided Weapon
* MRAV – (i) Multi-Role Armoured Vehicle
* MRBM – (i) Medium Range Ballistic Missile
* MRC – (i) Maintenance Requirements Card
* MRD – (i) Motorized Rifle Division
* MRE – (i) Meal Ready to Eat (U.S. military rations)
* MRGO – (i) Mississippi River–Gulf Outlet Canal (also referred to as MR-GO or "Mr. Go")
* MRGW – (i) Medium-range guided weapon
* mri – (s) Māori language (ISO 639-2 code)
* MRI – (i) Magnetic resonance imaging
* MRL – (i) Multiple rocket launcher
** (i) Montana Rail Link
* MRO
** (i) Maintenance, repair and operations
** Mars Reconnaissance Orbiter
** (s) Mauritanian ouguiya (ISO 4217 currency code)
* MRPharmS – (i) Member of the Royal Pharmaceutical Society (Great Britain)
* MRR – My Restaurant Rules
* MRS – (i) Magnetic Resonance Spectroscopy
* MRSA – (i/a) Methicillin-resistant Staphylococcus aureus (sometimes pronounced "MER-sa")
* MRT
** (i) Mass Rapid Transit — used as either an official or unofficial name for metro systems in Singapore, Kaohsiung, Bangkok, Taipei, Chennai, and Delhi
** (s) Mauritania (ISO 3166 trigram)
* MRTFB – (i) U.S. Major Range and Test Facility Base

## MS

* ms
** (s) Malay language (ISO 639-1 code)
** Millisecond
* mS – (s) Millisiemens
* Ms – (s) Megasecond
* MS
** (i) mano sinistra (Latin, "left hand")
** (p) manuscript
** (i) Master of Science
** (s) Megasiemens
** (p) Microsoft (sometimes M$)
** (s) Mississippi (postal symbol)
** Montserrat (ISO 3166 digram)
** (i) Multiple Sclerosis
* M&S
** (i) Modelling & Simulation
** Marks & Spencer
* MSA – (s) Malay language (ISO 639-2 code)
* MSB
** (i) Main Support Battalion
** Most Significant Bit (or Byte)
* MSD – (i) Minimum Safe Distance
* MSDB – (i) Multi Source Data Base
* MSDE
** (i) Maryland State Department of Education
** (p) Microsoft Data[base] Engine
** Microsoft SQL Server 2000 Desktop Engine
** (i) Military Scenario Development Environment
** Mission Simulation Dynamic Engine
* MSDL – (i) Military Scenario Definition Language
* MSE – (i) Multiple Subscriber Element
* MSFS - (i) Microsoft Flight Simulator (flight simulator series)
* MSEC – (p) Message Security Encryption Code ("emm-sec")
* MSG
** (i) MonoSodium Glutamate
** Madison Square Garden (either the 1879, 1890, 1925, or current versions of the venue)
* MSH
** (i) Medium Support Helicopter
** Mount St. Helens
* MSI
** (i) Micro-Star International
** (p) Multispectral imagery
* MSIE
** (i) Microsoft Internet Explorer
** Master of Science in Industrial Engineering
* MSL
** (i) Mars Science Laboratory
** Mean Sea Level
** (p) Missile
* MSLP – (i) Mean Sea Level Pressure
* MSM
** (p) Mainstream media
** (i) Men who have sex with men
** Mount St Mary's School
* MSN
** (i) Microsoft Network
** Master of Science in Nursing
* MSNBC – (i) Microsoft National Broadcasting Company Cable news channel (see also msnbc.com)
* MSO – (i) Multiple System Operator
* MSP
** Member of the Scottish Parliament
** (i) Minneapolis–Saint Paul - Twin cities in Minnesota
** (s) Minneapolis–Saint Paul International Airport (IATA code)
* MSPA
** (p) Migrant and Seasonal worker Protection Act
** (a) MS Paint Adventures
* MSPB – (i) Merit Systems Protection Board
* MSR
** (i) Main Supply Route
** Module Service Record
** (s) Montserrat (ISO 3166 trigram)
** (i) Motor Schlepp Regulung
** Mountain Safety Research (outdoor supplies manufacturer)
* MSSA
** Member of the Order of the Star of South Africa
** (i) Methicillin-susceptible Staphylococcus aureus
** (i) Military Selective Service Act
** (i) Military-style semi-automatic
** (i) Mind Sports South Africa
** (i) Montreal Student Space Associations
** MSSA Chemical Company, formerly known as Métaux Spéciaux.
* MST
** (i) Madison Symmetric Torus
** Mountain Standard Time (UTC−7 hours)
** Maastricht Aachen Airport (IATA code)
* MST3K or MST3k – (i) Mystery Science Theater 3000
* MSU
** (i) Michigan State University
** Montana State University
** Mountain State University
** Lomonosov Moscow State University (Russia, a.k.a. MGU)

## MT

* mt – (s) Maltese language (ISO 639-1 code)
* mT – (s) Millitesla
* Mt – (s) Meitnerium
* MT
** (s) Malta (FIPS 10-4 country code; ISO 3166 digram)
** Megatesla
** Montana (postal symbol)
** (i) Motor Transport (military)
* MTA
** (i) Metropolitan Transportation Authority (Boston) (now Massachusetts Bay Transportation Authority)
** Metropolitan Transportation Authority
* MTBF – (i) Mean time between failures
* MtF – (i) Male-to-female transsexual
* MTF
** (i) Magnetized target fusion
** Medical Treatment Facility
** Message Text Format
** Modulation transfer function (optics)
* MTG – (i) Magic: The Gathering
* MTL
** (s) Maltese lira (ISO 4217 currency code)
** (i) Mean Tide Level (nautical charts)* MTM – (i) Methods-Time Measurement
* MTOE – (p) Modified Table of Organization and Equipment ("emm-toe")
* MTP
** (i) Maritime Tactical Publication
** Materiel Transfer Plan
** Mission Training Plan
* MTQ – (s) Martinique (ISO 3166 trigram)
* MTR
** (i) Main and Tail Rotor (helicopter type)
** Mass Transit Railway (Hong Kong metro system)
** Military-Technological Revolution
* MTS
** (i) Maintenance Training System
** Manitoba Telephone System and Manitoba Telecom Services, former names of Bell MTS
** Michigan Terminal/Timesharing System
** Movement Tracking System
** Multichannel television sound
** Multi-Technical Services
* MTT – (p) Methylthiazol tetrazolium (assay)
* MTU
** (i) Tankovei Mostoukladchik (Russian Танковый Мостоукладчик, "Tank Bridge-Layer") †
** (i) Motoren- und Turbinen-Union (German engine manufacturer, now split into MTU Friedrichshafen and MTU Aero Engines)
* MTV
** (i) MainosTeleVisio (Finnish commercial TV company)
** Music TeleVision
* MTVL – (i) Mobile Tracked Vehicle, Light
* MTWS – (i) MAGTF Tactical Warfare System

## MU

* MU
** (s) Mauritius (ISO 3166 digram)
** (s) Oman (FIPS 10-4 country code; from Muscat)
** Manchester United (British football club)
* MUA
** (i) Meritorious Unit Award
** Military Utility Assessment
** (i) Make-up Artist
* MUR – (s) Mauritius rupee (ISO 4217 currency code)
* MUS – (s) Mauritius (ISO 3166 trigram)

## MV

* mV – (s) Millivolt
* MV – (s) Maldives (FIPS 10-4 country code; ISO 3166 digram) – Megavolt – (i) Motor Vehicle – Motor Vessel
* MVC – (i) Missouri Valley Conference
* MVFC – (i) Missouri Valley Football Conference
* MVNO – (i) Mobile virtual network operator
* MVP – (i) Most Valuable Player
* MVR – (s) Maldivian rufiyaa (ISO 4217 currency code)

## MW

* mW – (s) Milliwatt
* MW
** (i) Maintenance of way (also MOW)
** (s) Malawi (ISO 3166 digram)
** (i) Medium Wave (radio)
** (s) Megawatt
** (i) Mountain West (Conference) (formal initialism since July 2011)
* MWC
** (i) Maritime Warfare Centre (various nations)
** Mountain West Conference (still used informally, although the league has adopted "MW")
* MWESH – (p) Machismo Wizards Extended SHelter (operating system)
* MWI – (s) Malawi (ISO 3166 trigram)
* MWK – (s) Malawian kwacha (ISO 4217 currency code)
* MWOA – (i) Mount Wilson Observatory Association
* MWR – (i) Morale, Welfare, and Recreation
* MWTB - (a) Mounted Warfare Test Bed

## MX

* MX – (a) Mail Exchange – (s) Mexico (FIPS 10-4 country code; ISO 3166 digram) – (p) Missile eXperimental
* MXN – (s) Mexican peso (ISO 4217 currency code)

## MY

* my – (s) Burmese language (ISO 639-1 code)
* MY – (s) Malaysia (FIPS 10-4 country code; ISO 3166 digram)
* mya – (s) Burmese language (ISO 639-2 code) – (i) million years ago
* MYOB – (i) Mind Your Own Business
* MYR – (s) Malaysian ringgit (ISO 4217 currency code)
* MYS – (s) Malaysia (ISO 3166 trigram)
* MYT – (s) Mayotte (ISO 3166 trigram)

## MZ

* MZ – (i) Mach-Zehnder (interferometer) – (s) Magnetic Azimuth – (i) Move, Zig (Zero Wing) – (s) Mozambique (FIPS 10-4 country code; ISO 3166 digram)
* MZN – (s) Mozambique metical (ISO 4217 currency code)