| Abbreviation | Definition |
|---|---|
| INSTL&C/O | INSTaLlation and CheckOout |
| INSTR | INSTRuct |
| INSTR | INSTRumentation |
| INSTRUM | INSTRUMentation sub-system |
| INSTSYS | INSTrumentation SYStem |
| INT | INtegrated Test |
| INT | Intensity |
| INT | INTernal |
| INTASAT | Instituto Nacional De Technica Aeroespacial Satellite |
| INTC/O | Integrated Checkout |
| INTCHG | Interchange |
| INTCHGR | Interchanger |
| INTCP | Intercept |
| INTEGR | INTEGRate |
| INTEGR | Integrate, Integration |
| INTELSAT | International Telecommunications Satellite Organization |
| INTEROG | Interrogate |
| INTF | Interface |
| INTG | Integration |
| INTLK | Interlock |