| Meaning | Category |
| Icon Project Document | Computing->General |
| Ikon Police Department | Miscellaneous->Funnies |
| Image Per Dollar | Miscellaneous->Unit Measures |
| Immediate Pigment Darkening | Medical->Physiology |
| Implicit Price Deflector | Governmental->Transportation |
| Implied Probability of Default | Business->General |
| Inducing The Pleasure Dreams | Internet->Chat |
| Information Processing Division | Governmental->NASA |
| Initial Professional Development | Community->Educational |
| Inline Progression Dimension | Academic & Science->Mathematics |
| Insulated Patio Door | Academic & Science->Architecture |
| Integral Parameter Differences | Academic & Science->Mathematics |
| Integrated Product Development | Business->General |
| Intel Product Dealer | Business->General |
| Intelligent Product Division | Business->Firms |
| Intelligent Products Division | Business->Firms |
| Intelligent Pulse Decoding | Computing->Hardware Computing->Telecom |
| Inter Pupilary Distance | Medical->Physiology |
| Interactive Phase Distortion | Academic & Science->Electronics |
| Intermittent Peritoneal Dialysis | Medical->Hospitals |
| International Publishers Direct | Business->Firms |
| Inverse Power Distance | Academic & Science->Mathematics |
| Investment Property Databank | Business->General |
| Issue Priority Designator | Governmental->Military |
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