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Abkürzung-Kategorie: a
| Abkürzung | Langform |
| AALPDU | AAL Protocol Data Unit |
| AAM | Application Attachment Module |
| AAM | Alliance of Automobil Manufacturers |
| AAM | Automatic Acoustic Management |
| AAMA | American Automobil Manufacturers Association |
| AAN | All-Area Network |
| AAP | Applications Access Point |
| AAP | Advanced Adaptive Protocol |
| AAP | American Association of Publishers |
| AAP | amtlich anerkannter Prüfer |
| AAP | Beschleunigungshilfspumpe |
| AAPI | Audio Applications Programming Interface |
| AAR | All Activity Roadster |
| AAR | Automatic Air Recirculation |
| AAR | Anfangsadressregister |
| aaRdT | allgemein anerkannte Regeln der Technik |
| AARNET | Australian Academic Research NETwork |
| AARP | AppleTalk Address Resolution Protocol |
| AARU | Audi Accident Research Unit |
| AAS | Automatischer AntwortStromkreis |
| AAS | All-to-All Scatter |
| AAS | Advanced Automation System |
| AAS | Anfahrassistent |
| AAS | Adaptive Air Suspension |
| AAS | amtlich anerkannter Sachverständiger |
| AAS | Atomabsorptionsspektrometrie |
| AAS | Arithmetic Assignment Statement |
| AASF | Advanced Address Space Facility |
| AASP | ASCII Asynchronous Support Package |
| AASP | American national standard code for information interchange (ASCII) Asynchronous Support Package |
| AAT | Average Access Time |
| AATIS | Arbeitskreis Amateurfunk und Telekommunikation in der Schule |
| AAUI | Apple Attachment Unit Interface |
| AAV | Alternative Access Vendor |
| AAV | Arbeitsaufenthaltsverordnung |
| AAV | Anti-Afterburn Valve (Mazda) |
| AAV | Aktivkohlefilterabsperrventil |
| AAVD | Automatic Alternate Voice Data |
| AAX | Automated Attendant eXchange |
| AB | AnrufBeantworter |
| AB | AnschlussBereich |
| AB | AufgabenBeschreibung |
| AB | Afterburner |
| AB | Ausser Betrieb |
| AB | Hellblau-Weiß |
| ABANDA | Abfallanalysen-Datenbank (NRW) |
| ABAP | Advanced Business Application Programming (SAP) |
| ABATS | Automated Bit Access Test System |
| ABB | ABBreviated dialling |
| ABB | ASEA Brown Boveri (Schweiz) |