2W: 2-Wire
A/C: Air Conditioner
A/G: air to ground
A/V: Audio/Visual
AA: Audit Agent
AA: Automatic Answer
AAS: Automatic Announcement Subsystem
AB: Answer Back
abbr: abbreviation
ACA: Adaptive Channel Allocation
ACC: Area Control Center
ACF: Admission Confirm
ACG: Automatic Code Gapping
ACRE: Authorization and Call Routing Equipment
ACT: Activity
ACT: Applied Computerized Telephony
ADC: Administration Center
ADC: Advanced Data Controller
Add: Addendum
ADL: Advanced Distributed Learning
ADP: Automatic Data Processor
ADPC: automatic data processing center
ADT: American District Telegraph
ADU: Accumulation and Distribution Unit
AECT: Association for Educational Communications and Technology
AEW: Airborne Early Warning
AFCEA: Armed Forces Communications and Electronics Association
AI: Adapter Interface
AI: Airborne Interception
AIF: Audio Interchange Format
AIT: Automatic Identification Technology
ALT: Accelerated Life Test
ALT: Automatic Link Transfer
AM: Ante Meridian
AME: Amplitude Modulation Equivalent
AMHS: Automated Message Handling System
AMTI: Airborne Moving Target Indicator
AOI: Area of Interest
API: Application Programmer Interface
APS: Advanced Power System