| Acronym | Definition |
|---|
| ACAI | Advanced Course on Artificial Intelligence (European Coordinating Committee for Artificial Intelligence) |
| ACAI | Associazione Cristiana Artigiani Italiani (Italian: Italian Christian Artisans Association) |
| ACAI | American College of Allergy and Immunology |
| ACAI | As Cold As Ice (gaming clan) |
| ACAI | Associazione Calabrese Archeologia Industriale (Italian: Calabrese Industrial Archeology Association; Calabria, Italy) |
| ACAI | Associacio Catalana d'Intelligencia Artificial (Catalan Association for Artificial Intelligence) |