Abbreviations beginning with a

AC$Spooled plot file (AutoCAD AutoSpool)
Computing » File Extensions

AC&CAAlberta Consumer & Corporate Affairs (Canada)
Business

AC&FAmerican Car and Foundry
Miscellaneous

AC&IAcquisition, Construction, and Improvements
Governmental

AC&SEAutomatic Control and Systems Engineering (Sheffield University, UK)
Academic & Science

AC/AAccommodative Convergence/Accommodation Ratio (ophthalmology)
Academic & Science

AC/APSArtillery Communications/Aural Protection Systems
Governmental

AC/AUAutomatic Call / Answer Unit
Governmental

AC/BEAircrew Chemical/Biological Ensemble
Community

AC/DCAlternating Current/Direct Current
Academic & Science » Electronics

AC/DCAnti-Christ Devils Children
Community » Religion

AC/DCAdam Chew Dance Crew
Internet

AC/RCActive Component/Reserve Component
Governmental » Military

AC/RCActive Components/Reserve Components
Governmental » Military

AC:AAccommodative Convergence to Accomodation
Academic & Science

AC0Access Category 0 (lowest access priority)
Academic & Science

AC1Adenylyl Cyclase Type 1
Academic & Science