| Abbreviation | Definition |
|---|---|
| AAPINA | Asian American/Pacific Islander Nurses |
| AARC | African American Residence Caucus |
| AAUC | AVImark Annual User Conference |
| ABC | Academics Behavior Community |
| ABCA | Annual Bank Conference on Africa |
| ABCCC | Alton Bay Christian Conference Center |
| ABEC | Annular Bearing Engineers' Committee |
| ABFC | American Benedictine Formation Conference |
| ABIC | Agricultural Bioscience International Conference |
| ABIC | Aquatic Biodiversity International Conference |
| ABLC | Advanced Bioeconomy Leadership Conference |
| ABRC | American Bee Research Conference |
| ABSSOP | Application of the Behavioral Sciences to the Strategies of Peace |
| ABW | Abfall Energie Water |
| AC | Annual Conference |
| ACAC | Alberta College Athletic Conference |
| ACAC | Alberta Colleges Athletics Conference |
| ACAC | Allen County Athletic Conference |
| ACAC | Atlanta Competitive Advantage Conference |
| ACAD | American Conference of Academic Deans |