| Acronym | Meaning |
| AIP | Agreement In Principle |
| FTACH | Fourier Tachometer |
| ABFEL | Air-based Free-electron Laser |
| ATM | Asynchronous Transfer Mode |
| DCTN | Defense Commercial Telecommunications Network |
| ECMOP | Experimental Center For Mesoscale Ocean Predictions |
| ADC | Authorized Derivative Classifier |
| GCDIS | Global Change Data And Information System |
| ECN | Energy Research Foundation |
| PCM | Punched Card Machine |