| Meaning | Category |
| Main Engine Propellant | Governmental->NASA |
| Main Entry Point | Governmental->NASA |
| Major Emphasis Program | Governmental->US Government |
| Major Emphasis Projects | Miscellaneous->Unfiled |
| Major Emphesis Program | Miscellaneous->Unfiled |
| Management Engineering Program | Governmental->NASA |
| Manufacturing Extension Partnership | Business->General |
| Mary Elizabeth Putney | Miscellaneous->Unfiled |
| Massively Expensive Parasite | Miscellaneous->Unfiled |
| Master Evaluation Plan | Governmental->Military |
| Maximum Equalisation Percentage | Miscellaneous->Unfiled |
| Maximum Expiratory Pressure | Medical->Physiology |
| Maximum Extent Practicable | Miscellaneous->Construction |
| Mcdonalds Executive Promoter | Miscellaneous->Unfiled |
| Mean Effective Pressure | Academic & Science->Universities Governmental->NASA |
| Mechanical Electrical Plumbing | Business->Firms |
| Megakaryocyte Erythroid Progenitor | Miscellaneous->Unfiled |
| Member Edification Program | Miscellaneous->Unfiled |
| Member Of European Parliament | Governmental |
| Message Exchange Pattern | Computing->Networking |
| Metallo Endo Peptidase | Miscellaneous->Unfiled |
| Methanol Equivalent Productivity | Academic & Science->Chemistry |
| Migrant Employment Program | Governmental->US Government |
| Minimum Entry Point | Governmental->NASA |
| Ministerio de Educación Pública | International->Guatemalan |
| Minotaur Exploration Ltd | Business->ASX Symbols |
| Mission Essential Power | Governmental->Military |
| Mobile Electric Power | Governmental->Military |
| Model Editions Partnership | Community |
| Modelo Estructural De Proyecci | International->Spanish |
| Most Effective Profile | Computing->Networking |
| Most Entertaining Player | Miscellaneous->Unfiled |
| Motor End Platelet | Medical->Physiology |
| Motor Evoked Potentials | Medical->Physiology |
| Multi Engine Pilot | Business->Positions |
| Multi Events Packet | Miscellaneous->Unfiled |
| Multicultural Encouragment Program | Miscellaneous->Unfiled |
| Multiple Entry Points | Governmental->Military |
| Music Elective Program | Miscellaneous->Unfiled |
| The Manufacturing Extension Partner | Miscellaneous->Unfiled |
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