A-A stands for Disney's Audio-Animatronics
A-AUC stands for absolute area under the absorption curve
A-ARCS stands for Arctic Atmospheric Radiation and Cloud Station
A-BAT stands for Accelerator Based Analytical Techniques (database)
A-CDMA stands for Asynchronous Code Division Multiple Access
A-CELP stands for Algebraic-Code Excited Linear Prediction
AC stands for Aachen (Germany) AC stands for Abdominal Circumference (obstetrics) AC stands for Aberdeen College AC stands for Aberración…
a-CAE stands for antibodies to citric acid muscle extract
A-ENWG stands for Ada-Europe Numerics Working Group (est. 1984)
A-GNSS stands for Assisted Global Navigation Satellite System (also seen as AGNSS)