| Acronym | Sense | Language | Topics | 
|---|---|---|---|
| MDR | Manufacturing Design Review | In English | |
| MDR | Material Disposition Review | In English | |
| MDR | Mechanical Design Review | In English | → Mechanical engineering | 
| MDR | Midterm Design Review | In English | |
| MDR | Minor Discrepancy Repair | In English | |
| MDR | Missing Data Report | In English | |
| MDR | Mission Data Reduction | In English | |
| MDR | Mouvement Démocratique Républicain | In French | → Political parties and movements | 
| MDRC | Mongolian Development Research Center | In English | → Research institutes → Development  | 
| MDRD | Mission Data Requirements Document | In English | |
| MDRS | Mars Desert Research Station | In English | → Astronomy → Astronautics  | 
| MDRS | Manufacturing Data Retrieval System | In English | |
| MDRS | Mission Data Retrieval System | In English | |
| MDS | Micro Detoxification System | In English | |
| MDS | Microspheres-Based Detoxification System | In English | |
| MDS | Magnetic Disk System | In English | → Computer hardware | 
| MDS | Malfunction Detection System | In English | |
| MDS | Management Data System | In English | → Management | 
| MDS | Master Development Schedule | In English | |
| MDS | Minimum Discernible Signal | In English | |
| MDS | Mission Development Simulator | In English | → Computer simulation | 
| MDS | Médicament Dérivé du Sang ou du plasma humain | In French | → Pharmacology, toxicology | 
| MDS | Međimurski Demokratski Savez | In Croatian | → Political parties and movements | 
| MDSD | Model Driven Software Development | In English | → Software | 
| MDSD | Mate/Demate Stiff-Leg Derrick | In English | |
| MDSE | Manufacturing and Development Support Equipment | In English | |
| MDSS | Mission Data Support System | In English | |
| MDSSC | McDonnell Douglas Space Systems Corporation | In English | |
| MDST | Mission Director Support Team | In English | |
| MDST | Mission Disaster Support Team | In English | |
| MDT | Maintenance Demand Time | In English | → Maintenance and logistics | 
| MDT | Mean Detonating Time | In English | |
| MDT | Mean Downtime | In English | |
| MDT | Measurement Descriptor Table | In English | |
| MDT | Mountain Daylight Time | In English | |
| MDU | Mission Data Unit | In English | |
| MDU | Market Developpement Unit | In English | → Economics | 
| MDV | Map and Data Viewer | In English | |
| MDW | Military District of Washington | In English | → Military affairs → United States  | 
| ME | Main Engine | In English | → Vehicle engineering | 
| ME | Management Engineering | In English | → Management → Engineering, technology  | 
| ME | Manufacturing Engineering | In English | → Engineering, technology | 
| ME | Metallurgical Engineer | In English | → Metallurgy | 
| ME | Miscellaneous Equipment | In English | |
| ME | Mission Evaluation | In English | |
| ME | Myalgische Encefalomyelitis | In Dutch | → Neurology → Infectious diseases  | 
| ME | Mise en Équivalence | In French | → Accounting | 
| ME&D | Manufacturing Engineering and Development | In English | → Engineering, technology | 
| MEA | Main Electronics Assembly | In English | → Electronics | 
| MEA | Maintenance Engineering Analysis | In English | → Maintenance and logistics | 
| MEA | Management Engineering Activity | In English | → Management | 
| MEA | Modèle d'Évaluation par Arbitrage | In French | → Finance | 
| MEA-PPNCD | Machining and Electronic Packaging Optimization by Applications of Phase-Pure Nano-Crystalline Diamond | In English | |
| MEADS | Medium Extended Air Defence System | In English | → Military affairs → Military engineering  | 
| MEAO | Middelbaar Economisch en Adminstratief Onderwijs | In Dutch | → Education → Economics → Public administration, government  | 
| MeApp | Meteorological Applications | In English | → Serial publications, periodicals → Meteorology, climatology  | 
| MEAR | Maintenance Engineering Analysis Request | In English | → Maintenance and logistics | 
| MEAR | Manufacturing Engineering Analysis Report | In English | → Engineering, technology | 
| MEARC | Modern East Asia Research Centre | In English | → Research institutes → Area studies → Netherlands  | 
| MEAS | Middle Eastern and African Studies | In English | → Area studies | 
| MEB | Main Electronics Box | In English | → Electronics | 
| MEBA | Marine Engineers' Beneficial Association | In English | → Associations → 6295  | 
| MEBA | Michigan Elk Breeders Association | In English | → Associations → Agricultural sciences  | 
| MEBO | Main Engine Burnout | In English | → Vehicle engineering | 
| MEC | Middle East Center | In English | → Area studies | 
| MEC | Middle East Center (for Peace, Culture, and Development) | In English | → Civilization, culture, progress → Development  | 
| MEC | Ministerio de Educación, Cultura y Deporte | In Spanish | → Central administration → Education → Civilization, culture, progress  | 
| MEC | Ministerul Economiei şi Comerţului | In Romanian | → Central administration → Economics → Trade  | 
| MEC | Ministerul Educaţiei şi Cercetării | In Romanian | → Central administration → Education → Research policy  | 
| MEC | Main Engine Controller | In English | → Vehicle engineering | 
| MEC | Manual Emergency Control | In English | |
| MEC | Master Event Controller | In English | |
| MEC | Mission Events Controller | In English | |
| MEC | Miste En Corle | In Dutch | → Organizations and associations → Sport, physical exercises  | 
| MECA | Main Engine Controller Assembly | In English | → Vehicle engineering | 
| MECA | Missile Electronics Computer Assembly | In English | → Computer science → Electronics → Military engineering  | 
| MECACS | (Institute of) Middle East, Central Asia and Caucasus Studies | In English | → Area studies | 
| MECAS | Mission Equipment Configuration Accounting System | In English | → Accounting | 
| MECCA | Master Electrical Common Connector Assembly | In English | → Electrical engineering | 
| MecEn | Mechanical Engineering | In English | → Serial publications, periodicals → Mechanical engineering  | 
| MECF | Main Engine Computational Facilities | In English | → Computer science → Vehicle engineering  | 
| MECLSI | Mission Equipment Configuration Launch Site Installation | In English | |
| MECO | Main Engine Cutoff | In English | → Vehicle engineering | 
| MECO | Mekong Energy Company Limited | In English | → Energy economics → Electrical engineering  | 
| MECR | Maintenance Engineering Change Request | In English | → Maintenance and logistics | 
| MECSLSI | Mission Equipment Cargo Shuttle Launch Site | In English | → Astronautics | 
| MECSLSI | Mission Equipment Cargo Support Launch Site | In English | |
| MED | Manual Entry Device | In English | |
| MED | Momentum Exchange Device | In English | |
| MEd | Magister Educationis | In Latin | → Education | 
| MED | Multi-Effect Distillation | In English | → Environmental technology, water supply, waste management | 
| MED | Mayall Engineering Database | In English | → Data → Astronomy  | 
| MEDAF | Modèle d'Équilibre des Actifs Financiers | In French | → Finance | 
| MEDCASE | Medical Care Support Equipment | In English | → Medicine | 
| MEDD | Ministère de l'Écologie et du Développement Durable | In French | → Central administration → 5023  | 
| MEDDAC | Medical Department Activity | In English | → Medicine | 
| MEDEF | Mouvement des Entreprises de France | In French | → Organizations and associations → Economics  | 
| MEDICS | Medical Information Computer System | In English | → Computer science → Medicine  | 
| MEDRA | Medical Dictionary for Drug Regulatory Activities | In English | → Dictionaries → Pharmacology, toxicology  | 
| MEDRC | Middle East Desalination Research Center (www.medrc.org) | In English | → Research institutes → Environmental technology, water supply, waste management → Chemical technology  | 
| MEDS | Mechanical Engineering Design System | In English | → Mechanical engineering | 
| MEE | Mission-Essential Equipment | In English | |
| MEE | Ministère de l'Environnement et de l'Eau | In French | → Central administration → 5023 → Hydrology → 627,  | 
| MEECN | Minimum Essential Emergency Communication Network | In English | → Networks, communication → Telecommunications  | 
| MEEDDM | Ministère de l'Ecologie, de l'Énergie, du Développement Durable et de la Mer | In French | → Central administration → Environmental protection → Ecology → Energy economics → Fishing, hunting  | 
| MEEI | Magyar Elektrotechnikai Ellenőrző Intézetre | In Hungarian | → Electrical engineering → Hungary  | 
| MEEI | Massachusetts Eye and Ear Infirmary (www.masseyeandear.org) | In English | → Surgery, orthopaedics, ophthalmology → Ophthalmology → United States  | 
| MEEI | Mar Elias Educational Institutions | In English | → Education | 
| MEEI | Mechanical Engineering Energy Institute | In English | → Energy economics → Mechanical engineering  | 
| MeeRe | Kenneth Mees Observatory Reprints | In English | → Serial publications, periodicals → Astronomy  | 
| MEEREA | Malta Energy Efficiency & Renewable Energies Association | In English | → Associations → Energy economics → Malta  | 
| MEF | Myocyte Enhancer Factor | In English | → Biochemistry, biophysics | 
| MEF | Malaysian Employers Federation | In English | → Organizations and associations → Labour, labour economics  | 
| MEF | Middle East Forum | In English | → Organizations and associations → Area studies  | 
| MEF | Mount Everest Foundation | In English | → Foundations | 
| MEF | Ministère de l'Économie et des Finances | In French | → Central administration → Economics → Finance  | 
| MEF | Managed Extensibility Framework (http://mef.codeplex.com) | In English | → Software | 
| MEFE | Mission-Essential-Function Equipment | In English | |
| MEG | MagnétoEncéphaloGraphe | In French | → Medicine | 
| MEG | Magnetoencephalography | In English | → Neurology | 
| MEGA | Master Européen de Gouvernance et d'Administration | In French | → Higher education, universities → Public administration, government  | 
| MEGA | Mpumalanga Economic Growth Agency | In English | → 33972 | 
| MEGEP | Mesleki Eğitim ve Öğretim Sisteminin Güçlendirilmesi Projesi (http://megep.meb.gov.tr) | In Turkish | → Central administration → Education  | 
| MEHARI | Méthode Harmonisée d'Analyse des Risques | In French | → Software → 00441  | 
| MEHSG | Mise En et Hors Service Gaz | In French | → Energy economics | 
| MEI | Middle East Institute | In English | → Area studies | 
| MEI | Mouvement des écologistes indépendants | In French | → Political parties and movements | 
| MEI | Main Engine Ignition | In English | → Vehicle engineering | 
| MEI | Master End Item | In English | |
| MEI | Mathematical Engineering Industry | In English | → Serial publications, periodicals → Mathematics → Engineering, technology  | 
| MEi:CogSci | Middle European interdisciplinary master programme in Cognitive Science | In English | → Social sciences | 
| MEISP | Middle Eastern and Islamic Studies Program | In English | → Islam → Area studies  | 
| MEIU | Main Engine Interface Unit | In English | |
| MEJ | Middle East Journal | In English | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history  | 
| MEJ | Mouvement Eucharistique des Jeunes = MEJ | Movimiento Eucaristico Juvenil | In Spanish  | 
In French | → Organizations and associations → Christianity  | 
| MEJ | Movimiento Eucaristico Juvenil = (look above)  | 
In Spanish | → Organizations and associations → Christianity  | 
| MEJ | Middle Earth Journal | In English | → Serial publications, periodicals | 
| MEJ | Music Educators Journal | In English | → Serial publications, periodicals → Education → Music  | 
| MEJ | (The) Middle East Journal | In English | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history  | 
| MEK | Methylethyl Ketone | In English | → Chemical technology | 
| MEK | Mission Equipment Kit | In English | |
| MEK | Magyar Elektronikus Könyvtár | In Hungarian | → Electronics → Hungary  | 
| MEK | Mobile Einsatzkommando | In German | → Police | 
| MEKARO | MezKanada Renkontiĝo de Esperanto | In Esperanto | → Congresses → Artificial languages (linguistics) → Canada  | 
| MEKF | Mission Equipment Kit Facility | In English | |
| MEL | Muzika Esperanto Ligo | In Esperanto | → Organizations and associations → Music → Artificial languages (linguistics)  | 
| MEL | Minimum Equipment List | In English | |
| MEL | Maya Embedded Language | In English | → Graphical processing → Image processing → Cinema, movies  | 
| MelAR | Melbourne Observatory Annual Report | In English | → Serial publications, periodicals → Astronomy  | 
| MELC | Mechanical Engineering Liaison Committee | In English | → Organizations and associations → Mechanical engineering  | 
| MELF | Metal ELectrical Face | In English | → Electrical engineering | 
| MELI | Master Equipment List Index | In English | |
| MelOO | Melbourne Observatory Observations | In English | → Serial publications, periodicals → Astronomy  | 
| MELROSE | Mitsubishi Electric Road Traffic Simulation Environment | In English | → Computer simulation → Transport and postal services  | 
| MEM | Middle East Medievalists | In English | → Organizations and associations → History  | 
| MEM | Mondpaca Esperantista Movado | In Esperanto | → Organizations and associations → Politics → Artificial languages (linguistics)  | 
| MEM | Mars Excursion Module | In English | → Astronautics | 
| MEM | Meteoroid Exposure Module | In English | → Astronomy → Astronautics  | 
| MEM | Mid-Deck Electronics Module | In English | → Electronics | 
| MEM | Module Exchange Mechanism | In English | |
| MEM | Movimento de Escola Moderna | In Portuguese | → Organizations and associations → Education  | 
| MEMA | Meath Energy Management Agency | In English | → Energy economics | 
| MEMC | Mission Essential Minor Construction | In English | → Civil engineering → Construction  | 
| MEMCH | Movimiento Pro-Emancipación de las Mujeres de Chile | In Spanish | → Organizations and associations → Feminism  | 
| MEMMS | Modélisation des Écosystemes Marins et Monitoring par Satellites | In French | → Threats to the environment → Marine research, oceanography → Astronautics  | 
| MEMO | Montreal Esperanto Movement = MEMO | Mouvement Espéranto-Montréal | In French = MEMO | Montreala Esperanta Movado | In Esperanto  | 
In English | → Organizations and associations → Artificial languages (linguistics) → Canada  | 
| MEMO | Mouvement Espéranto-Montréal = (look above)  | 
In French | → Organizations and associations → Artificial languages (linguistics) → Canada  | 
| MEMO | Montreala Esperanta Movado = (look above)  | 
In Esperanto | → Organizations and associations → Artificial languages (linguistics) → Canada  | 
| MEMP | Middle East Microform Project | In English | |
| MEMRI | Middle East Media Research Institute | In English | → Research institutes → Newspapers, journalism  | 
| MEMS | Mikro Elektro-Mekanik Sistem = MEMS | Micro-Electro-Mechanical System | In English  | 
In Turkish | → Mechanical engineering → Electrical engineering  | 
| MEMS | Micro-Electro-Mechanical System = (look above)  | 
In English | → Mechanical engineering → Electrical engineering  | 
| MEN | Ministerstwo Edukacji Narodowej (www.ms.gov.pl) | In Polish | → Central administration → Education → Poland  | 
| MEN | Ministère de l'Éducation Nationale | In French | → Central administration → Education  | 
| MENA | Middle East and North Africa | In English | → Geography | 
| MENARG | Middle East and North Africa Research Group | In English | → Organizations and associations → Social sciences → Area studies  | 
| MENBO | Mediterranean Network of Basin Organisations | In English | → 626 → 627  | 
| MENESR | Ministère de l'Éducation Nationale, de l'Enseignement Supérieur et de la Recherche | In French | → Central administration → Education → Research policy  | 
| MENIC | Middle East Network Information Centre | In English | → Libraries | 
| MENJS | Ministère de l'Éducation Nationale, de la Jeunesse et des Sports | In French | → Central administration → Education → Sport, physical exercises  | 
| MENS | Mission Element Needs Statement | In English | |
| MEO | Manufacturing Engineering Order | In English | → Engineering, technology | 
| MEO | Mid Earth Orbit | In English | → Astronomy → Astronautics  | 
| MEOP | Maximum Expected Operating Pressure | In English | |
| MEP | Member of European Parliament | In English | → Parliaments, representation | 
| MEP | Malneta Enlanda Produkto = PIB | Produit Intérieur Brut | In French = GDP | Gross Domestic Product | In English = BKT | Bruttokansantuote | In Finnish = PIB | Producte Interior Brut | In Catalan = PIL | Prodotto Interno Lordo | In Italian = BNO | Bruto Nationoal Product | In Vlaams = BBP | Bruto Binnenlands Product | In Dutch  | 
In Esperanto | → Economics | 
| MEP | Main Engine Propellant | In English | → Astronautics | 
| MEP | Management Engineering Program | In English | → Management → Engineering, technology  | 
| MEP | Manipulator Engineering Panel | In English | |
| MEP | Mean Effective Pressure | In English | |
| MEP | Medium External Pressurized | In English | |
| MEP | Minimum Entry Point | In English | |
| MEP | Mutuelle des Étudiants de Provence | In French | → Insurance → Education  | 
| MEP | Mise En Production | In French | |
| MEPCOM | Military Enlistment Processing Command | In English | → Military affairs | 
| MEPS | Military Entrance Processing Station | In English | → Military affairs | 
| MER | Mission Evaluation Room | In English | |
| MERCATOR | Mise En Réseau de la Cartographie Appliquée à la Typologie des Ouvrages et des Réseaux | In French | → Energy economics → Electrical engineering  | 
| MeReC | Mechanics Research Communications | In English | → Serial publications, periodicals → Mechanics  | 
| MERIA | Middle East Review of International Affairs | In English | → Serial publications, periodicals → International relations → Geography, biography, history  |