| Abbreviation | Definition |
|---|---|
| INTR | Interior |
| INTR | INTeriorR |
| INTRG | Interrogate |
| INTRLVR | Interleaver |
| INTRPT | Interrupt |
| INTV | Interim Hypersonics Test Article |
| INTV | INterim hypersonics Test Vehicle |
| INTVL | Interval |
| INTVLM | Intervalometer |
| INV | Inverter |
| INVMGT | Inventory Management |
| IOA | Input/Output Adapter |
| IOB | Input/Output Box |
| IOB | Input/Output Buffer |
| IOBPS | Input/Output Box and Peripheral Simulator |
| IOC | Indirect Operating Costs |
| IOC | Initial Operating Capability |
| IOC | Input/Output Controller |
| IOCL | Inter-satellite Optical Communications Line |
| IOCM | Interim Operational Contamination Monitor |