| Subject | English | Thesaurus |
| abbr. | application alignment service | app alignment service (ssn) |
| IT, abbr. | Application Control Architecture Services | ACAS (DEC) |
| abbr. | application layer gateway service | app layer gateway service (ssn) |
| comp., abbr. | Application Print Services | APS |
| comp., net., abbr. | Application Provider Services | APS |
| comp., net., abbr. | Application Services Environment | ASE |
| abbr. | Common Applications and Tools Integration Services | CATIS |
| abbr., file.ext. | Extended Messaging Services Application Programming Interface | EMSAPI |
| abbr., comp., MS | Generic Security Services Application Programming Interface A generic API for performing client-server authentication that can be implemented over any authentication system. GSS-API makes it possible for applications to use the same API with different authentication mechanisms | GSS-API (Generic Security Services Application Programming Interface) |
| abbr., file.ext. | License Services Application Program Interface | LSAPI |
| IT, abbr. | Licensed Services Application Program Interface | LSAPI (MS, API) |
| abbr., comp., net. | Macintosh Application Services | MAS |
| IT, abbr. | Network Application Services | NAS (DEC) |
| busin., abbr. | Operational Application Support Information Services | OASIS |
| busin., abbr. | Outsourced Application Software And Information Services | OASIS |
| progr. | safety application service element | SASE (ssn) |
| IT, abbr. | Switched Digital Services Applications Forum | SDSAF (organization) |
| abbr., scottish | Technology Applications & Services Co. | TAS (USA) |
| IT, abbr. | Telephony Services Application Program Interface | TSAPI (AT&T - Novell) |
| abbr., file.ext. | Telephony Services Application Program Interface | TSAPI (AT&T and Novell) |
| abbr., IT | Telephony Services Application Programming Interface | TSAPI |
| IT, abbr. | Web Services for Interactive Applications | WSIA (OASIS, WWW) |
| comp., net., abbr. | Web Services for Interactive Applications | WSIA |
| abbr. | Workshop on Applications and Services in Wireless Networks | ASWN |
| abbr., astronaut. | World Climate Applications and Services Programme | WCASP (proposed title, WMO) |
