a
- A3D
- Abort
- AC
- AC 97
- Access Time
- Accumulator
- ACK
- ACPI
- ACR
- Acrobat
- Action Center
- Active Matrix
- ActiveX
- Actuator
- Adaptive Compression
- ADC
- ADD2
- Addressability
- admin rights
- administrator
- ADSL
- AGP
- AHCI
- AI
- AIIF
- AirPrint
- Aliasing
- Alpha
- Alpha Blending
- Alpha Channel
- Alt
- ALU
- AM
- Ambient Light Sensor
- AMR
- Analogue
- Analogue Video
- Anamorphic
- AND Gate
- Android
- Animated GIF
- Anode
- ANSI
- Answer Mode
- Anti-aliasing
- anti-virus
- Aperture Grille
- APFS
- API
- App
- Apple ID
- Apple Intelligence
- Apple Menu
- Apple Silicon
- Application
- Archive
- Areal Density
- Argument
- Arrow Keys
- Artefact
- ASCII
- ASIC
- Aspect Ratio
- ASPI
- Asset
- Astigmatism
- Asymmetrical Compression
- Asynchronous
- Asynchronous Cache
- Asynchronous Communication
- AT Bus
- AT Command Set
- ATA
- ATAPI
- Athlon XP
- ATM
- ATSC
- ATX
- Audio Card
- Augmented Reality
- Authoring System
- Auto Refresh
- Auto-Reliable Mode
- Automatic Dialling
- Autoscan
- Avatar
- AVC
- Average Seek Time
- AVI
- AWG