| AAGTP | Aerobic Attached-Growth Treatment Process | |
| AB | Aerobic Bacteria | |
| ABEB | Archives in Biomedical Engineering Biotechnology | |
| ABL | Agricultural Biotechnology Laboratory | |
| ABM | Agriculture Biotech and Medical | |
| ABRC | Agricultural Biotechnology Research Center | |
| ABSP | Agricultural Biotechnology Support Program | |
| ABWG | Animal Biotechnology Working Group | |
| ACB | Asian Congress on Biotechnology | |
| ACCP | ASNT Central Certification Program | |
| ACH | Air Changes Per Hour ( The movement of a volume of air in a given period of time) | |
| ACI | Anderson Cascade Impactor | |
| AD | Aerobic Decomposition | |
| ADP | Air Displacement Plethysmography | |
| AER | Air Exchange Rate | |
| AF | Aerobic Fermentation | |
| AFOB | Asian Federation of Biotechnology | |
| AIB | All India Biotech Association | |
| AIBM | Advances in Biotechnology Microbiology | |
| AIBM | Advances In Biotechnology and Microbiology | |
| AIRCA | Association of International Research and Development Centers for Agriculture | |
| AJB | African Journal of Biotechnology | |
| AJBMS | American Journal of Biotechnology and Molecular Sciences | |
| AM | Aerobic Metabolism | |
| AMAB | Applied Microbiology and Biotechnology |
