| Acronym | Definition |
|---|
| STDI➣Short-Term Disability Insurance |
| STDI➣Small Town Design Initiative |
| STDI➣Southwest Technology Development Institute (New Mexico State University; Las Cruces, NM) |
| STDI➣Science and Technology Diplomacy Initiative (UN Conference on Trade and Development) |
| STDI➣Special Technical Development Investigation |
| STDI➣Systolic Time Diameter Index |