American Bar Association 
American Bankers Association 
American Booksellers Association 
Applied Behavior Analysis 
American Basketball Association 
Architectural Barriers Act 
American Board of Anesthesiology 
American Burn Association 
American Bus Association 
abscisic acid 
American Banking Association 
Association for Behavior Analysis 
Aberrated Beam Analyzer 
acid-base account 
acrylonitrile-butadiene acrylate 
Adaptive Battlespace Awareness 
Agaricus bisporus agglutinin 
Air Brake Association 
American Birding Association 
American, British, Australian 
Applied Behavioral Analysis 
Australian Basketball Association 
Australian Biotechnology Association 
abscissic acid 
Académie des Beaux-Arts 
Acquisitions and Bibliographic Access 
Active Brazing Alloy 
activity-based anorexia 
Address Book Archive 
Advanced Ballistic Algorithm