Associate of Applied Science 
Alive And Smiling 
American Astronautical Society 
American Astronomical Society 
Atomic Absorption Spectroscopy 
Airport Advisory Service 
All-to-All Scatter 
ASIA SMITH 
Associate in Applied Science 
atomic absorption spectrometry 
Australian Accounting Standard 
Automated Accounting System 
Abort Advisory System 
Advanced Antenna System 
Advanced Automated System 
Advanced Automation System 
Aeronautical Advisory Station 
African Academy of Sciences 
Agencywide Administrative Systems 
Alternative Air Source 
American Antiquarian Society 
American Association of Suicidology 
Ancient Astronaut Society 
Arithmetic Assignment Statement 
atomic absorption spectrometer 
Atomic Absorption Spectrophotometer 
atomic absorption spectrophotometry 
Attack Assessment System 
Authorized Application Specialist 
Automatic Announcement Subsystem