| Meaning | Category |
| Empty | Internet->Chat |
| Machine Translation | Computing->Assembly |
| Magnetic Tape | Computing->General |
| Malta | Regional->Countries |
| Maltese | Regional->Language Codes (2 Letters) |
| Management Of Technology | Academic & Science->Academic Degrees |
| Management Team | Business->General |
| Manual traction | Medical->Physiology |
| Margaret Thatcher | Community->Famous |
| Marine Terminal | Business->International Business |
| Marked Text | Computing->General |
| Marker Type | Governmental->Transportation |
| Master Taxidermist | Business->Positions |
| Master Tools | Business->Firms |
| Master Trainer | Business->Positions |
| Matera (Provence) | International->Italian |
| Mating Type | Academic & Science->Electronics |
| Matrix | Governmental->Suppliers |
| Maximal Therapy | Medical->Physiology |
| Meaningful Talk | Internet->Chat |
| MediTrust | Business->NYSE Symbols |
| Medical Technologist | Business->Positions |
| Meitnerium | Academic & Science->Chemistry |
| Menu Text | Computing->General |
| Message Transmission | Computing->Telecom |
| Metal Treatment | Academic & Science->Chemistry |
| Metered Tariff | Computing->Telecom |
| Metric Ton | Governmental->Military Governmental->Transportation |
| Metric Tonne | Miscellaneous->Unit Measures |
| Metric Tonnes | Miscellaneous->Unit Measures |
| Metric Tons | Miscellaneous->Unit Measures |
| Micro Tubules | Academic & Science->Electronics |
| Micron Technologies | Business->Firms |
| Micron Technology | Business->Firms |
| Mid Term | Academic & Science->Universities |
| Mike Trout | Community->Famous |
| Millennium Turkey | Miscellaneous->Funnies |
| Million Tons | Miscellaneous->Unit Measures |
| Miniature Theater | Community |
| Miniature Tube | Medical->Laboratory |
| Ministerio de Trabajo | International->Spanish |
| Mint Tea | Miscellaneous->Food |
| Miss Tell | Internet->Chat |
| Missile Technology | Business->International Business |
| Mississippi and Tennessee RailNet Incorporated | Regional->Railroads |
| Mitochondrial Targeting | Medical->Human Genome |
| Mobile Telephone | Computing->Telecom |
| Mobile Terminal | Computing->Telecom |
| Modus Tollens | International->Latin |
| Moluccas Time [ GMT 0830] | Regional->Time Zones |
| Money Talks | Miscellaneous->Toastmasters |
| Monitor Type | Computing->General |
| Montana | Regional->US States |
| More Than | Medical->Physiology |
| Most Troublesome | Community->Law |
| Mother Tongue | Regional->Language Codes (2 Letters) |
| Mountain Time [ GMT - 0700] | Regional->Time Zones |
| Movable Type | Computing->Software |
| Move Tutor | Business->Positions |
| Movement Tracker | Governmental->Military |
| Multi Threaded | Internet->Chat |
| Muscle Test | Medical->Physiology |
| Muscles And Tendons | Medical->Physiology |
| Music Trader | Business->Firms |
| Musical Theater | Community->Performing Arts |
| Musical Theatre | Community->Media |
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