| Abbreviation | Definition |
|---|---|
| ACFI | American Culture and Faith Institute |
| ACFI | American Culture Faith Institute |
| ACHI | African Community Health Institute |
| ACI | American Cleaning Institute |
| ACI | American Concrete Institution |
| ACI | Assyrian Cultural Institute |
| ACIB | Associate of Chartered Institute of Bankers |
| ACII | Associate Chartered Insurance Institute |
| ACII | Associate of Chartered Insurance Institute |
| ACII | Associateship of the Chartered Insurance Institute |
| ACIPS | Associate Chartered Institute of Purchasing and Supply |
| ACIT | Anindo Chatterjee Institute of Tabla |
| ACIT | Atlantic County Institute of Technology |
| ACLI | Advanced Critical Language Institute |
| ACLI | African Cancer Leaders Institute |
| ACMI | Art and Craft Materials Institute |
| ACMI | Art and Creative Materials Institute |
| ACMI | Art Creative Materials Institute |
| ACMI | Asia Capital Markets Institute |
| ACP | American College of Physicians |