| Acronym | Definition |
|---|
| SEIF➣Sparse Extended Information Filter (autonomous navigation) |
| SEIF➣Siondróm Easpa Imdhíonachta Faighte (Irish: AIDS) |
| SEIF➣Substance Information Exchange Forum (open database for information on commercial chemicals in the EU) |
| SEIF➣Sawteeth-Arm Embracing Internal Fixator (bone healing) |