| Abbreviation | Definition |
|---|---|
| ILEF | Inducing Lateral Electric Field |
| ILM | Integrated Laser Modulator |
| ILPAP | (Greek: Ηλεκτροκίνητα Λεωφορεία Περιοχής Αθηνών – Πειραιώς Η.Λ.Π.Α.Π. - Electric Buses of Athens & P |
| ILS | Instrument Landing System |
| ILS | Intracavity Laser Spectroscopy |
| IM | Impedance Matcher |
| IM | Instrument Management |
| IM | Integrated Model |
| IM | Interface Map |
| IMA | Interactive Multimedia Association |
| iMac | Internet MacIntosh |
| IMaR | Intelligent Mechatronics and RFID |
| IMD | Inter-Metal Dielectric |
| IMD | Inter-Modulation Device |
| IMD | Inter-Modulation Distortion |
| IMD1 | First-order Inter-Modulation Distortion |
| IMD2 | Second-order Inter-Modulation Distortion |
| IMD3 | Third-order Inter-Modulation Distortion |
| IMD4 | Fourth-order Inter-Modulation Distortion |
| IMD5 | Fifth-order Inter-Modulation Distortion |