| Abbreviation | Definition |
|---|---|
| MECA | Manufacturers Of Emission Controls Association |
| MECA | Manyu Elements And Cultural Association |
| MECA | Muslim Educational And Cultural Association |
| MECA | The Manufacturers Of Emissions Controls Association |
| MEDA | Midwest Equipment Dealers Association |
| MEDA | Missouri Energy Development Association |
| MEDC | Maharashtra Economic Development Council |
| MEDC | Manchester Engineers Design Consortium |
| MEDEF | Mouvement des entreprises de France |
| MEHA | Middle East Hearing Association |
| MEMA | Motor Equipment Manufacturers Association |
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| MESHA | Media for Environment, Science, Health and Agriculture |
| MFCA | Michigan Fire Chiefs Association |
| MFMA | Maple Flooring Manufacturers Association |
| MGFA | Minnesota Grain and Feed Association |
| MGLA | Motion Graphics Los Angeles |
| MGLC | Multicultural Greek Letter Council |
| MGLS | Minerals and Geotechnical Logging Society |
| MGM | Mixed General Meeting |