| Meaning | Category |
| IEEE Micro Robots and Teleoperators Workshop | Academic & Science->IEEE |
| Magnetic Resonance Therapy | Medical->Hospitals |
| Mail Relay Test | Computing->Networking |
| Malignant Rhabdoid Tumour | Medical->Oncology |
| Management Review Team | Governmental->US Government |
| Mass Rafflesian Transit | Academic & Science->Universities |
| Mass Railway for Tourists | Governmental->Transportation |
| Mass Rapid Transit | Governmental->Transportation |
| Mass Rapid Transport | Governmental->United Nations |
| Mass Rice Train | Miscellaneous->Food |
| Matrix Regeneration Therapy | Medical->Oncology |
| Mean Residence Time | Medical->Hospitals |
| Medical Radiologic Technologist | Medical |
| Migration Review Tribunal | Community->Media |
| Mildew Resistant Treatment | Community->Housing |
| Military Ruggedized Tablet | Computing->Hardware |
| Ministre de la Recherche et de la Technologie | Academic & Science->Ocean Science |
| Missile Round Trainer | Governmental->Military |
| Mission Readiness Test | Governmental->NASA |
| Moral Recognition Therapy | Community->Law |
| Moroak River, Northern Territory, Australia | Regional->Airport Codes |
| Mountain Rescue Team | Governmental->Police |
| Movement Regulating Team | Governmental->Military |
| Multiple Requesting Terminal | Computing->General |
| Männer organisieren Radikale Therapie | Community->Non-Profit Organizations |
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