| Meaning | Category |
| Mach Interface Generator | Governmental->Military |
| Maintenance and Installation Group | Governmental->Military |
| Management Improvement Guidance | Business->General |
| Management Intensive Grazing | Miscellaneous->Farming |
| Marauder Intruder Group | Governmental->Military |
| Meadowbrook Insurance Group, Inc. | Business->NYSE Symbols |
| Media International Group | Business->Firms |
| Member In Good standing | Business->Positions |
| Membership Initiative Group | Community->Non-Profit Organizations |
| Message Implementation Guidelines | Governmental->US Government |
| Metal Inert Gas | Academic & Science->Chemistry |
| Metal-Insert Gas | Business->Products |
| Metallic Inert Gas | Academic & Science->Chemistry |
| Military Intelligence Group | Governmental->Military |
| Mist-Inhibiting Glass | Business->Products |
| Mobile Interactive Games | Community->Sports |
| Moody's Investment Grade | Business->Accounting Business->Stock Exchange |
| Mortgage Indemnity Guarantee | Business->General |
| Much Information Given | Academic & Science->Mathematics |
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