| Abbreviation | Definition |
|---|---|
| ACS | Another Cisco Server |
| ACSE | Adaptive Circuit Switched Emulation |
| ACSR | Algebra of Communicating Shared Resources |
| ACT | Accountability Communication And Tracking |
| ACT | Advanced Client Technologies |
| ACTS | Advanced Communications Technologies And Services |
| ACU | Aironet Client Utility |
| ACU | Automatic Client Upgrade |
| ACV | Access Control Vector |
| ADAP | Auto-Discovery, Auto-Purge |
| ADB | Apple Data Bus |
| ADB | Apple Desktop Bus |
| ADC | Active Data Connector |
| ADC | Analog to Digital Converter |
| ADC | Auxiliary Domain Controller |
| ADCS | Active Directory Certification Service |
| ADCS | Advanced Directory Comparison and Synchronization |
| ADCU | Asynchronous Data Channel Unit |
| ADDS | Active Directory Domain Service |
| ADE | Automatic Directory Exchange |