| Abbreviation | Definition |
|---|---|
| ARAD | Architected Rapid Application Development |
| ARAP | Arkansas Regional Adventure Programming |
| ARAS | A Radio Automation System |
| ArboNET | Software for Arboviral Surveillance and Case Management |
| ARBT | Augmented Reality-Based Testing |
| ARC | Automatic Reference Counting |
| ARCOS | Automated Reports and Consolidated Orders System |
| ARD | Architecture Requirement Document |
| ARFD | Applications and Reasons for Decision |
| ARG | Automated Reasoning Group |
| ARGC | argument count |
| ARIA | Activmedia Robotics Interface for Applications |
| ARIS | Architecture of Integrated Information Systems |
| ARIS | Augmented Reality Image Synthesis |
| ARM | Annotated C++ Reference Manual |
| ARM | Application Response Measurement |
| ARMS | Amiga Records Management System |
| ARNOLD | Advanced Results Notification and On-Line Delivery |
| ARNS | AppleTallk Remote Network Server |
| AROS | Amiga Research Operating System |