Megacycle (IDOE)
Memory Configuration (NAKS)
Meter-Candle (IDOE)
Micro (SHCU)
Millicurie (IDOE)
Mission Capability - NASA (NAKS)
Mission Completion/Continuation - NASA (NAKS)
Monaco - MARC country of publication code - Library of Congress (LCCP)
Maccabees - Old Testament book - Roman Catholic canon
Manchester, Chetham Library (SAUO)
Mandible Coronoid (STED)
Megacurie
Megacycle
AEM Marketing Council (EA)
Aermacchi SpA - Italy - ICAO aircraft manufacturer identifier (ICAO)
CAA Flying Unit - British - ICAO designator (ICDA)
Cambridge Public Library, Cambridge, MA - Library symbol - Library of Congress (LCLS)
Chemists' Club - Formerly, Mining Club (EA)
Consolata Missionary Sisters - Roman Catholic religious order
Department of Mass Communication (SAUO)
Macalester College (SAUO)
Macau - GeoNet country code (GEON)
Machine Cancellation - Philately
Machine Check - Computer science (IAA)
Machine Code (IAA)
Machine Console
Machine Cycle (IAA)
Machinery Certificate - Shipping
Macula Coloboma - Medicine (MELL)
Madison College (SAUO)
Madonna College (SAUO)
Magic Circle - An association (EA)
Magister Chirurgiae - Master of Surgery
Magistrates Cases - Legal term - British
Magistrates Court (SAUO)
Magnesium Chlorate - Inorganic chemistry
Magnetic Card - Word processing
Magnetic Clutch
Magnetic Core
Magnetic Course - Navigation
Mail Chute (DAC)
Mailet College (SAUO)
Main Cabin
Main Channel
Main Chute (KSC)
Main Cock
Main Color - Crocheting
Main Condenser - Nuclear energy (NRCH)
Main Coolant (MSA)
Maine Central (SAUO)
Maine Coast Railroad - Federal Railroad Administration identification code
Maintenance Center (MCD)
Maintenance Command - Obsolete - Air Force - British
Maintenance Console
Maintenance Cycle (MCD)
Major Component
Major Consultants, Inc. - Commercial firm
Major Critical (ACAE)
Major Cycle
Makers of Canada - A publication
Making Capacity (IAA)
Malayan Cases - 1908-58 - A publication (DLA)
Malignant Carcinoid - Medicine (MELL)
Malone College (SAUO)
Managed Care - Insurance (WYGK)
Managed Competition
Management Center (VLIE)
Management Code (ALAC)
Management Committee (IAA)
Management Contents - Information Access Co. - Information service or system (IID)
Management Council (SAUO)
Manatee College (SAUO)
Manchester College (SAUO)
Manganese Centre (EA)
Manhattan College (SAUO)
Manhattanville College (SAUO)
Manhole Cover
Manned Core (SSD)
Manpower Commission (NADA)
Manpower Council - Northern Ireland (BUAC)
Mantle Cavity
Mantle Collar
Manual Code (NITA)
Manual Control
Manufacturing Center (TIMI)
Manufacturing Change (IAA)
Mapping Camera
Mapping Center (SAUO)
Maps and Charts - Interservice - NATO
Mare Crisium - Sea of Crises - Lunar area
Marginal Check - Computer
Marginal Checking (NITA)
Marginal Cost - Business term
Margin Call - Banking, investments
Maria College (SAUO)
Marian College (SAUO)
Marietta College (SAUO)
Marine Corps
Marine Craft - British military (DMA)
Marion College (SAUO)
Marist College (SAUO)
Maritime Commission - of Department of Commerce - Merged with Federal Maritime Commission
Mark Cross - Initials often used as pattern on Mark Cross leather goods
Marked Capacity - Freight cars
Market Capacity (ADA)
Marketing Center - Veterans Administration
Mark of the Craft - Freemasonry
Marlboro College (SAUO)
Marmon Club (EA)
Marque de Commerce - Trademark
Marriage Certificate
Married Couple (ADA)
Marshall College (SAUO)
Martin Co. (MCD)
Martin College (SAUO)
Mary College (SAUO)
Marycrest College (SAUO)
Maryglade College (SAUO)
Marygrove College (SAUO)
Maryheart Crusaders (EA)
Marylhurst College (SAUO)
Marymount College (SAUO)
Maryville College (SAUO)
Marywood College (SAUO)
Mass Communication (NTCM)
Mast Cell
Mast Controller (DNAB)
MasterCard - Credit card
Mastercard International - New York, NY (EA)
Master Change (IAA)
Master Clock (IAA)
Master Commandant
Master Commander - Navy - British (ROG)
Master Control
Master Controller (SAUS)
Master of Ceremonies
Master of Chemistry
Master of Classics
Master of Commerce
Master of Communication
Master of Congress - British (DAS)
Master of Counseling
Master of Criminology (SAUO)
Master of Surgery (SAUO)
Matara Cases - Ceylon - A publication (DLA)
Material Center (SAUO)
Material Code (MCD)
Material Control (AAG)
Materials Committee (MCD)
Materiel Center (SAUO)
Materiel Change - Military
Materiel Command - Air Force
Materiel Concept - Army
Mathematical Center (IAA)
Matsushita Electric Industrial (SAUO)
Matsushita Electric Industrial Co. Ltd. - NYSE symbol (SPSG)
Matsushita Electric Industrial Company Ltd. - NYSE symbol
Matsushita El Ind ADR - NYSE symbol
Mature Cataract (MELL)
Maunaolu College (SAUO)
Maury Center for Ocean Science - Washington, DC
Maximum Concentration
Maximum Count Output (IAA)
Mayor's Court (DLA)
Mazda Club (EA)
Measure Code (NITA)
Measuring Core (HAWK)
Mechanical Council (EA)
Medfall Group - Commercial firm
Media Coalition - Later, MC/ACF (EA)
Medial Canthus (MELL)
Medical Cabinet (SAUO)
Medical Care, Civilian Source (DNAB)
Medical Center
Medical Certificate (ADA)
Medical College (SAUO)
Medical Consultant - Social Security Administration (OICC)
Medical Corps - Navy
Medicine Cabinet - Technical drawings (NFPA)
Medicines Commission (SAUO)
Medium Capacity - or Charge - Bomb
Medium Case bomb (SAUS)
Medium-Chain - Triglycerides - Biochemistry (MAE)
Medium Curing - Asphalt grade
Medugorje Center (EA)
Medullary Cavity - Medicine (MELL)
Medullary Cystic Disease - Medicine (AAMN)
Megacycles (VLIE)
Megacycles per Second (IAA)
Megalocornea (MELL)
Melamine Council - Defunct (EA)
Melter Cell (ABAC)
Member of Congress
Member of Council
Memorandum Club - Defunct (EA)
Memorandum of Conditions
Memorial Commission - Federal body
Memory Cell - Immunology (QSUL)
Memory Channel - Computer science (GART)
Memory Charts
Memory Clear - Computer science
Memory Configuration - Computer science (MCD)
Memory-Constrained - Computer science
Memory Control - Unit - Computer science
Memphis College (SAUO)
Menlo College (SAUO)
Mennonite Church (SAUO)
Mercury Club - Defunct (EA)
Mercury Contact (IAA)
Meredith Corp. (EFIS)
Merkel Cell - Anatomy
Mesa College (SAUO)
Mesenteric Collateral - Cardiology (DAVI)
Mesiocervical - Dentistry
Message Center
Message Change (MCD)
MessageCheck (EA)
Message Composer - Communications, data processing
Mess Call - Military
Metacarpal - or Metacarpus - Anatomy
Metal Carbide
Metal Case - Bullet (DICI)
Metal Clad (IAA)
Metaling Clause - Marine insurance
Metallurgical Consultants, Inc. - Commercial firm
Metatarsocuneiform - Orthopedics (DAVI)
Meteorological Codes (SAUO)
Meter-Candle
Methacholine Challenge - Medicine
Methodist Chaplain
Methodist Church (WDAA)
Methyl Carbamate - Organic chemistry
Methylcellulose - Organic chemistry
Methylchloroform - Organic chemistry
Methylcholanthrene - Also, MCA - Organic chemistry
Methylcystyosine - Biochemistry
Methylene Chloride - Organic chemistry
Metric Carat - 200 milligrams
Metrology Center (SAUO)
Metropolitan Counties - British
Michigan Central (SAUO)
Michigan Central Railroad - Absorbed into Consolidated Rail Corp. - AAR code
Michigan Central Railroad Co. (SAUO)
Michigan Chemical Corp.
Michoacan - NCIC Mexican state code (NCIC)
Microcarrier - Cell culture technology
Microcell (SAUS)
Microcephaly - Medicine (AAMN)
Micro-Chem Laboratories - Commercial firm
Microchromatographic
Micro Compact Car AG (EFIS)
Micro Composer (SAUS)
Microcomputer (IAA)
Microcontrol
Microcrystalline Cellulose (DB)
Microfilm Corporation (SAUO)
Microminiature Circuit (IAA)
Micronesia Coalition - Defunct (EA)
Microphase Corporation (SAUO)
Microstat Corporation (SAUO)
Midcourse
Midcourse Correction (SAA)
Middle Chamber - Freemasonry
Middle Creek Railroad (IIA)
Midland College (SAUO)
Miles City - Horse racing entrants (HRTC)
Miles College (SAUO)
Miles on Course
Military Characteristics
Military College - British (ROG)
Military Committee - NATO
Military Community (COE)
Military Computer (IEEE)
Military Construction (AFM)
Military Coordination - British
Military Cross - World War I nickname: Maconochie Cross - British
Mill Cutter - Tool (MCD)
Millicycle - Also, as millihertz (WGA)
Milligan College (SAUO)
Millipore Corp. - Bedford, MA
Millipore Corporation (SAUO)
Mills College (SAUO)
Milsaps College (SAUO)
Milton College (SAUO)
Mindcrash
Mine Clearance - British military (DMA)
Mine Counter-Measures - Military technology (DDF)
Mineralocortcoid
Mini-Cartridge (SAUS)
Minimum Call - Television studio on standby
Mining Club (EA)
Ministry of Commerce (SAUO)
Minkowski-Chauffard - Syndrome - Medicine (DB)
Minor Construction (AFIT)
Minorities in Cable - Defunct (EA)
Mirror Coil (MCD)
Miscarriage - Obstetrics (DAVI)
Miserriocordia College (SAUO)
Misionaras Clarisas - Poor Clare Missionary Sisters - Roman Catholic religious order
Missile Car (SAA)
Missile Checkout
Missile Code (MUGU)
Missile Command - Army
Missile Compartment
Missile Container
Missile Control
Missile Controller (SAUS)
Missionaries of Charity - Roman Catholic women's religious order
Missionary Catechists of the Sacred Hearts of Jesus and Mary - Violetas - Roman Catholic women's religious order
Missionary Church (EA)
Mission Capability - NASA (NASA)
Mission Capable (SAUO)
Mission Completion (MCD)
Mission Computer (MCD)
Mission Continuation (MCD)
Mission Control - NASA
Mission Critical (SAUO)
Mississippi Central - Railroad (MHDB)
Mississippi Central Railroad (IIA)
Mitchell College (SAUO)
Mitchell Cotts Group Ltd. (SAUO)
Mitochondrial Complementation
Mitomycin - Also, M, MT - Antineoplastic drug
Mitotic Cycle - Biochemistry (DAVI)
Mitoxantrone, Cytarabine - Antineoplastic drug (CDI)
Mitral Valve Closure - Cardiology
Mitsubishi Corporation (SAUO)
Mixed Cell - Lymphoma classification
Mixed Cellularity - Biochemistry (DAVI)
Mixed Condition - Deltiology
Mixed Cryoglobulinemia - Medicine
Mixing Chamber
Mixture Control - Automotive engineering
Mnemonic Code (AAG)
Mobile Control (DEN)
Mobile Crane (DCTA)
Mobility Control Center (SAUO)
Mobilization Center (SAUO)
Mode Change (CET)
Mode Code
Mode Control (IAA)
Mode Counter
Model Cities (OICC)
Modem Controller - Telecommunications (IAA)
Modification Center (SAUO)
Modular Computer
Moisture Content - Lumber (WOHB)
Moisture Content
Molded Components (IEEE)
Molecular Contamination - of Clean rooms
Molten Core
Momentary Contact - Electronics
Monaco - ANSI two-letter standard code (CNC)
Moneda Corriente - Current Money - Spanish
Monetary Committee
Monetary Contact
Monitor and Control - Computer science (BUR)
Monitor Call - Computer science (IBMDP)
Monitoring Center (SAUO)
Monkey Cells
Monkey Complement - Immunology
Monmouth College (SAUO)
Monocomponent Highly Purified Port Insulin - Endocrinology - Pharmacology (DAVI)
Monocoupe Club (EA)
Mononuclear Cell - Clinical chemistry - Also, MNC
Monopolies Commission - British (DCTA)
Monotype Caster (DGA)
Monte Carlo - Calculation technique - Nuclear energy (NUCP)
Montecatini Mining & Chemical Co. (SAUO)
Montessori Center - Education
Monticello College (SAUO)
Moravian College (SAUO)
Morehouse College (SAUO)
Morgan Crucible Co. Ltd. (SAUO)
Morris College (SAUO)
Morse Code
Morse Code - Barry Morse Fan Club (EA)
Mortar Carrier - British
Mortgage Constant (DICI)
Mortgage Credit Condition (EMRF)
Mostly Cloudy - Climatology (CERES)
Mothercraft Certificate - British (ADA)
Motor Car (IAA)
Motor Carrier
Motor Chain
Motor Coaches - Public-performance tariff class - British
Motor Contact (WGA)
Motor Converter (IAA)
Motor Cortex - Neuroanatomy
Motorcycle
Motorcycle Driver - British military (DMA)
Mount Carmel Fraternity (SAUO)
Movement Control - of troops
Moving Coil - Electronics (DEN)
Muan Chon - Mass Party - Political party
Mucous Cell
Muhlenberg College (SAUO)
Multi Carrier (SAUS)
Multi Cast (SAUS)
Multi-channel - Military technology (DDF)
Multichip - Circuit - Electronics
Multichromatic
Multicomputing (IAA)
Multiconfiguration - Quantum mechanics
Multipartisan Coalition (EA)
Multiple Choice
Multiple Contact
Multiple Cyclones (EEVL)
Multiplex Channel (IAA)
Multiply-Convolve (SAUS)
Multipoint Controller (TELEC)
Multnomah College (SAUO)
Mundelein College (SAUO)
Munitions Command - Later, Armaments Command - Army
Murtha Cullina, L.L.P. - Commercial firm
Mushroom Caucus (EA)
Muskingum College (SAUO)
Muskogee College (SAUO)
Mycelial - of fungi (AAMN)
Myelocytomatosis - Avian disease
Myocarditis - Medicine
Myotonia Congenita - Medicine
Poor Clare Missionary Sisters (TOCD)
Rapidair - ICAO designator (AD)
Royal Military College (SAUO)
Saugus Marine Corporation (SAUO)
Submarine Chaser - Navy symbol
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