| Abbreviation | Definition |
|---|---|
| ACCP | Accelerated Canopy Chemistry Program |
| ACGH | Array Comparative Genomic Hybridization |
| ACGM | Advisory Committee for Genetic Modification |
| ACMV | African Cassava Mosaic Virus |
| ACNP | Audubon Center for Native Plants |
| ACRF | African Cichlid Resource Forum |
| ADAM | Aliveness, Diversity, Aeration, Moisture |
| ADEPT | Allele Discovery of Economic Pine Traits |
| ADS | American Daffodil Society |
| AF | After Fall |
| AFA | Aphanizomenon Flos-Aquae |
| AG | Anastomosis Group |
| AI | Active Ingredient |
| AIBG | Australian Inland Botanic Gardens |
| ALLU | Aletris Lutea Small (plant) |
| ANBG | Australian National Botanic Gardens |
| AOB | Annals Of Botany |
| AOS | American Orchid Society |
| APAF | Apoptotic Protease Activating Factor |
| APAF1 | Apoptotic protease activating factor 1 |