| Acronym | Definition |
|---|
| aFRR➣Automatic Frequency Restoration Reserve (energy) |
| aFRR➣Ascorbate Free Radical Reductase (plant physiology) |
| aFRR➣Annual Fixed Revenue Requirement (energy regulation) |
| aFRR➣Alpha Frame Rate Reduction |
| aFRR➣Alabamians for Real Reform (political group) |
| aFRR➣Air Force Recognition Ribbon |
| aFRR➣Associação Fluminense de Radioamadorismo e Rádio do Cidadão (Portugese) |