| Abbreviation | Definition |
|---|---|
| APETT | Advanced Power Electronic Technology and Tools |
| APF | All-Pass Filter |
| APG | Asia Pacific Gateway |
| APHMEL | Andhrapradesh Heavy Mechanary and Electronics Limited |
| API | Allocation Programming Identification |
| APIMS | Atmospheric Pressure Ionization Mass Spectrometry |
| APME | Antenna pointing mechanism electronics |
| APOT | Alternate Point Of Termination |
| APS | Advanced Power Stability |
| APS | American Physical Society |
| APS | Analog Protection System |
| APS | Auto Power Spectrum |
| APS | Auxiliary Power System |
| APS | Institute of Electrical and Electronic Engineers Antennas and Propagation Society |
| APSEB | Andhra Pradesh State Electricity Board |
| APT | Audio Pass Through |
| APTL | Automatic Power Transfer and Load control |
| APVD | Alcatel Plasma Vapor Deposition |
| APW | Augmented Plane Wave |
| AQ | All Quartz |