| Meaning | Category |
| Independent Distance Learning | Community->Educational |
| Interactive Data Language | Academic & Science->Ocean Science Governmental->NASA |
| Interface Definition Language | Academic & Science->Electronics Computing->Software |
| Interface definition file (Visual C) | Computing->File Extensions |
| Interfacility Data Link | Governmental->Transportation |
| Interim (or Interoperable) Data Link | Governmental->Military |
| Intermediate Density Lipoprotein | Medical->Oncology |
| International Date Line | Regional->Time Zones |
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