| Acronym | Sense | Language | Topics |
|---|---|---|---|
| AC | Alternating Current | In English | → Electrical engineering |
| AC | Atlas Centaur | In English | |
| AC | Advanced Composite | In English | → Plastic industry → Chemical technology |
| AC | Aerodynamic Center | In English | → Aerodynamics → Aeronautics, aircraft |
| AC | Application Controller | In English | |
| AC | Assembly Complete | In English | |
| AC | Audio Center | In English | |
| AC | Auxiliary Computer | In English | → Computer hardware |
| AC | Administration Centrale | In French | → Central administration |
| AC | Apostolic Carmel | In English | → Roman catholic church |
| AC | Akademikernes Centralorganisation (www.ac.dk) | In Danish | → Organizations and associations → Labour, labour economics → Denmark |
| AC | Algemene Centrale | In Dutch | → Organizations and associations → Labour, labour economics |
| AC | Admission Control | In English | |
| AC | Agent Comptable | In French | → Accounting |
| AC | Autorité de Contrôle | In French | → Public administration, government |