| Acronym | Definition |
|---|
| AEIF➣Armco Employees Independent Federation |
| AEIF➣Association Européenne pour l'Interopérabilité Ferroviaire (French: European Association for Railway Interoperability) |
| AEIF➣Airport Environment Improvement Foundation (Japan) |
| AEIF➣Advantage Enterprise and Innovation Fund (UK) |
| AEIF➣Automotive Engineering Innovation Framework (automotive development software; IBM) |