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A (amp)  Ampere
AA  Atomic absorption  
AAF  Advanced Authoring Format  
AAS  Atomic absorption spectroscopy  
ABS  Antilock braking system  
AC  Activated carbon  
AC  Air Conditioner.
AC  Alternating Current 
ACA  Anisotropically Conductive Adhesive  
ACC  Adaptive Cruise Control  
ACCESS  Analysis computer for component engineering services support  
ACFA  Advanced CMOS Frame Aligner  
ACI  Adjacent Channel Interference  
ACI  After clean inspection
ACIA  Asynchronous Communications Interface Adapter  
ACPR  Adjacent Channel Power Ratio  
ACT  Actual Cycle Time  
ACT  Alternative Control Techniques 
ACWG  Asymmetrical CoPlanar Waveguide  
AC/DC  Alternating current or direct current 
ADC  Analog-to-digital converter 
ADE  Advanced development environment  
ADI  After develop inspection  
ADIG  Application development interface guidelines  
ADIO  Analog/digital input/output  
ADMA  Advanced DMA controller   
ADP  Administrative data processing  
ADPCM  Adaptive differential pulse code modulation  
ADS  Advanced Design System  
ADSL  Asymmetric Digital Subscriber Line  
ADT  Applied Diagnostic Techniques 
ADT  Automatic Detection and Tracking  
ADTV  Advanced Definition TV  
AE  Acoustic emission 
AE  Atomic emission 
AE  Auger electron 
AEC  Advanced Equipment Controller 
AEC  Architecture Engineering and Construction 
AECS  Automated Equipment Control System  
AEI  After etch inspection
AEI  Automated equipment interface  
AEM  Analytical Electron Microscopy  
AES  Advanced Encryption Standard  
AES  Auger Electron (Emission) Spectroscopy 
AESA  Active Electronically Steered Array  
AF  Audio frequency 
AFAICS  As Far As Eyes Can See 
AFC  Automatic flow controller
AFC  Automatic frequency control 
AFD  Application framework definition  
AFT  Automatic fine tunung 
AGC  Automatic gain control 
AGP  Accelerated Graphics Port
AGV  Automated guided vehicle  
AI  Adobe Illustrator image format  
AI  Artificial Intelligence
AICTE  All India Council Of Technical Education.
AIS  Adhesive Interconnect System  
ALD  Atomic Layer Deposition  
ALE  Application Logic Element  
ALS  Advanced light source 
ALS  Advanced low-power Schottky  
ALU  Arithmetic logic unit  
ALVT  Advanced low voltage technology  
AM  Amplitude Modulation.
AM  Ante Meridian (before noon)  
AMD  Alpha micro devices  
AMDM    ATM Multiplexer/DeMultiplexer. 
AMH  Automated material handling  
AMHS  AMH Systems  
AMI  Alternate Mark Inverse Code  
AML  Automatic model linking  
AMLCD  Active Matrix LCD  
AMM  Acoustic Mismatch Model
AMM  Analog multimeter 
AMPS  Advanced Mobile Phone Systems.
AMRAAM  Advanced Medium Range Air-to-Air Missile  
AMT  Advanced manufacturing technology  
AMU  Atomic mass unit  
AM/FM  Amplitude modulation or Frequency modulation 
ANA  Automated Network Analyzer  
ANN  Artificial Neural Network  
ANSI  American National Standards Institute  
AOI  And-Or-Invert  
AOI  Automatic Optical Inspection 
AOV  Air-Operated Valve  
AP  Adhesion Promoter  
APA  Advanced Performance Algorithm  
APB  Anti Phase Boundary  
APC  Advanced Process Control
APC  Automatic phase control
APCD  Add-on Pollution Control Devices  
APCFI  Advanced Process Control Framework Initiative  
APCVD  Atmospheric Pressure Chemical Vapor Deposition  
APC-7  Amphenol Precision Connector, 7 mm
APD  Avalanche Photo Diode  
APDP  Anti-Parallel Diode Pair  
APEC  Advanced Process Equipment Control  
API  Application Programming Interface 
API  Atmospheric Pressure Ionization  
APIMS  Atmospheric Pressure Ionization Mass Spectroscopy  
APM  Acoustic Plate Mode  
APM  Atmospheric Passivation Module 
APS  American Physical Society 
APS  Antenna Positioning System  
APT  Advanced Probe Technology 
APT  Automatically Programmed Tools  
APW  Augmented Plane Wave  
AQI  ACCESS Query Interface  
AQL  Acceptance Quality Level 
AQTX  Aquatic Toxicity  
AR  Aspect Ratio  
ARAMS  Automated Reliability, Availability, and Maintainability Standard
ARC  Antireflective Coating  
ARCOFI  Audio Ringing Codec Filter  
ARDE  Aspect-Ratio-Dependent Etching  
ARIB  Association of Radio Industries and Businesses  
ARIMA  Auto Regressive Moving Average with Integration  
ARINC  Aeronautical Radio Incorporated  
ARO  After Receipt of Order  
ARPA  Advanced Research Projects Agency
ARPES  Angular Resolved Photo Electron Spectroscopy  
ARPU  Average Revenue Per User  
ARS  Angle-Resolved Scattering  
ARUPS  Angle-Resolved UV Photoemission Spectroscopy  
ARXPS  Angle Resolved XPS  
ASAP  Advanced Stepper Application Program  
ASCII  Alphabetic Code For Information Exchange 
ASCII  American Standard Code for Information Interchange 
ASE  Amplified Stimulated Emission  
ASF  Windows Media Technology File Format  
ASIC  Application Specific Integrated Circuit.
ASIC  Application Specific Semiconductor  
ASK  Amplitude Shift Keying.
ASLAC  Advanced Subscriber Line Audio processing interface   
ASLIC  Advanced Subscriber Line Interface   
ASLV  Augmented Sattelite Launch Vehicle.
ASO  Automatic Shut-Off  
ASP  Advanced Simple Profile  
ASP  Advanced Strip and Passivation 
ASP  Advanced Strip Processor 
ASP  Application Service Provider 
ASR  Automated Send Receive  
ASSMBE  All Solid Source MBE  
ASSP  Application Specific Standard Product  
ASTM  American Society for Testing and Materials  
ASTTL  Advanced Schottky TTL  
ASW  Augmented Spherical Wave  
AS/RS  Automated Storage and Retrieval System  
AT & T  American Telegraph and Telegraph Co.Ltd.
ATC  Air Traffic Control.
ATDF  Advanced Tool Development Facility  
ATDSEM  Apply/Develop Track Specific Equipment Model  
ATE  Automatic Test Equipment  
ATF  Automation Test Facility 
ATG  Automatic Test Generation  
ATLAS  Abbreviated Test Language for All Systems  
ATM  Adobe Type Manager
ATM  Asynchronous Transfer Mode.
ATM  Atmosphere 
ATM  Automatic Teller Machine
ATP  Advanced Technology Program 
ATPG  Automatic Test Pattern Generation  
ATR  Air Transport Rack 
ATR  Anti Transmit-Receive cells  
ATR  Attenuated Total Reflectance 
ATR-FTIR  Attenuated total reflectance Fourier transform infrared spectroscopy  
ATSC  Advanced Television Systems Committee.
ATT  Attenuated  
AVC  Automatic Volume Control  
AVP  Advanced Vertical Processor  
AVRC  Audio Visual Research Centre
AVS  Advanced Visualization System  
AVT  Accelerated Vesication Test  
AWE  Asymptotic Waveform Evaluation  
AWG  American wire gauge 
AWG  Arbitrary Waveform pattern Generator.
AWGN  Additive White Gaussian Noise  
AWS  Advanced Wet Station  
A/D  Analog to digital 
Ac  Actinium  
Ag  Silver  
Ah  Ampere hour 
Ai  Current gain
Al  Aluminum  
ALT  Alternating  
Amp  Amplifier  
AND  Logic term - AND   
antilog  Antilogarithm 
Ap  Power gain 
As  Arsenic  
ASPaRC  Ability of Solder Paste to Retain Components  
Async  Asynchronous  
Au  Gold  
Av  Voltage gain