Mesencephalic (DB)
Maharashtra Ekikaran Samithi - India - Political party (PPW)
Main Engine Start - NASA (KSC)
Main Equipment Supplier (NATG)
Maine State Planning Office, Augusta, ME - OCLC symbol (OCLC)
Mainly English-Speaking
Maintenance Electrolyte Solution - Physiology
Major Equipment Supplier (ACAE)
Malaysian Economic Society (SAUO)
Management Engineering Squadron - Air Force
Managing Editor Software, Inc. (SAUO)
Manned Exploration Site (MCD)
Manual Entry System - or Subsystem (IEEE)
Manuals of Elementary Science - A publication
Manufacturing Enterprise Solution (READ)
Manufacturing Execution System (CAL)
Manufacturing Execution Systems (READ)
Manufaturing Execution System - Engineering
Mapping and Earth Science (ELAL)
Marine Environmental Services (SAUO)
Marine Evacuation System (SAUO)
Marketable Equity Securities - Investment term (DICI)
Marketing Encyclopedia System (GART)
Masmaje - Language code (ETLW)
Mass Expulsion System (MCD)
Master, Environmental Studies (CMD)
Master Erection Schedule (DNAB)
Master of Engineering Science (SAUO)
Master of Engineering Sciences
Master of Engineering Studies
Master of Environmental Science (DD)
Master of Environmental Studies (PGP)
Master of Special Education (PGP)
Mated Elements - or Events Simulator - NASA (MCD)
Mated Events Simulator
Maximal Electroshock - Physiology
Maximum Electroshock Seizure - Medicine
Mechanical Engineering Society (SAUO)
Medan - Indonesia - Airport symbol (OAG)
Medical Electronics Society - Defunct (EA)
Medical Emergency Service - Medicine (EDAA)
Medical Equipment Set - Army
Medium Energy Source (SAUS)
Medium Energy Source Program - Air Force
Medsource Systems, Inc. - Vancouver Stock Exchange symbol
Melville Corp. - Formerly, Melville Shoe Corp. - NYSE symbol (SPSG)
Mesaba Aviation - ICAO designator (FAAC)
Mesh Composites, Inc., Lake Charles, LA - Manufacturer code for watercraft hull identification number (USCG)
Mesozoic - Period, era, or system - Geology
Message Entry Subsystem (SAUO)
Message Entry System (MCD)
Messina - Italy - Seismograph station code, US Geological Survey (SEIS)
Mesylate - Organic chemistry
Metalsmith (Sheet Metal Worker) - U.S. Navy enlisted rating (AUER)
Meteorological Evaluation Services Company, Inc. - Commercial firm
Mexican Epigraphic Society (EA)
Michael E. Stogner - Air show performer (ASPC)
Michigan Engineering Society (SAUO)
Middle Eastern Studies - University of Texas (APS)
Midwest Electronic Society (SAUO)
Military Engineering Services - Government construction agency in India (CDIAC)
Military Engineer Services - British
Mine Effects Simulator - Military technology (DDF)
Minerals Engineering Society - British
Miniature Edison Screw
Minimum Efficiency Scale
Minor Earth Stations (ACAE)
Miscellaneous Equipment Specification (HGAA)
Missile Electrical Simulator
Missile Engineering Station
Mission Events Sequence (MCD)
Mobile Earth Station (DA)
Modal Emission Model (SAUO)
Modern European Studies - Old name of European Social and Political Studies
Moessbauer Emission Spectroscopy
MOL - Manned Orbiting Laboratory Environmental Shelter
Monitoring Energy Systems
More Effective Schools - Program - Defunct
Morpholinoethanesulfonic Acid - A buffer
Motor End Support
Movimento de Esquerda Socialista - Movement of the Socialist Left - Portugal - Political party (PPE)
Moving Earth Simulator (MCD)
Multiengine Sea - Pilot rating (AIA)
Multilinear Events Sequencing - Engineering
Multiple Earning Statement - Banking (MHDW)
Multiple Endocrine Syndrome - Endocrinology
Myoelectric Signal
South Methodist Episcopal Church (SAUO)
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