| Abbreviation | Definition |
|---|---|
| ACI | After Clean Inspection |
| ACI | Automatic Component Insertion |
| ACL | Active Current Loop |
| ACL | Aliasing Controlling Language |
| ACLF | Automatic Channel Locking Filter |
| ACM | Absolute Characteristic Maxima |
| ACM | Aluminum Conductor Material |
| ACM | Association for Computing Machinery |
| ACM | Audio Compression Manager |
| ACME | Advanced Cold Molecule Electric |
| ACN | Accelerator Controls Node |
| ACP | Azimuth Counter Pulse |
| ACPDB | Alternate Current Power Distribution Box |
| ACPI | Advanced Configuration and Power Integration |
| ACPI | Advanced Control Power Interface |
| ACR | Automatic Circuit Recloser |
| ACRF | Attenuation Crosstalk Ratio at Farend |
| ACRP | Automatic Contact Resistance Probe |
| ACS | Adjacent Channel Selectivity |
| ACS | Advanced Communications System |