| Abbreviation | Definition |
|---|---|
| ACAA | All Campus Advising Association |
| ACAA | Amador County Artists Association |
| ACAA | Amazigh Cultural Association in America |
| ACAA | American Coal Ash Association |
| ACAA | American Collegiate Athletic Association |
| ACAA | Atlantic Colleges Athletic Association |
| ACAC | Association for Child and Adolescent Counseling |
| ACAL | Association of Child Abuse Lawyers |
| ACAM | American Counseling Association of Missouri |
| ACAM | Association Culturelle Arménienne de Marne-la-Vallée |
| ACAO | Alberta College and Association of Opticians |
| ACAO | Association of Chief Academic Officers |
| ACAP | Association for Community Affiliated Plans |
| ACAP | Association of Chinese American Physicians |
| ACAP | Association of Chinese American Professionals |
| ACAS | Association of Comic Artists Singapore |
| ACASA | Albuquerque Chapter of the American Statistical Association |
| ACASA | Atlantic Climate Adaptation Solutions Association |
| ACASH | Association of Corporations and Apex Societies of Handlooms |
| ACAUS | Association of Chartered Accountants in the United States |