MDI
- 1501
- Bayley Scales of Infant Development
- MD1
- Major Depression Inventory
- Management Development Institute
- Media Delivery Index
- Medium-dependent interface
- Merchants Distributors, Inc.
- Metered-dose inhaler
- Methylene diphenyl diisocyanate
- Michelson Doppler Imager
- Microsoft Document Imaging Format
- Mission Data Interface
- Motor Development International
- Mount Desert Island
- Movement for Democracy and Independence
- Multiple drug intake
- Multiple-document interface
- Random forest
- Social Security Disability Insurance
- Supplemental Security Income