| Abbreviation | Definition |
|---|---|
| MDHHS | Montana Deaf and Hard of Hearing Services |
| MDHSS | Maine Department of Health and Senior Services |
| MDHSS | Missouri Department of Health and Senior Services |
| MDIF | Maryland Deposit Insurance Fund |
| MDNC | Management Directions of North Carolina |
| MDNR | Maryland Department of Natural Resources |
| MDS | Monthly Digest of Statistics |
| MDSS | Missouri Department of Social Services |
| MDT | Montana Department of Transportation |
| MEA | Maine Education Assessment |
| MEA | Major Economic Area |
| MEA | Michigan Education Association |
| MEAP | Maryland Energy Assistance Program |
| MEC | medical eligibility criteria |
| MECCU | Medical Eligibility Criteria for Contraceptive Use |
| MECP | Ministry of Environment, Conservation and Parks |
| MEDA | Maryland Economic Development Association |
| MEDA | Michigan Economic Developers Association |
| MEDA | Middle Eastern Dance Association |
| MEDA | Montana Economic Developers Association |