postcode for Aberdeen
• British fishing port registration for Aberystwyth
• able(-bodied) seaman or rating
• advisory board
• air board
• airborne
• US Air Force Airman Basic
• Alberta (Canada )
• Alliance balkanique (French: Balkan Alliance)
• ammonia for bees (applied for stings)
• antiballistic (missile)
• asthmatic bronchitis
• Baseball (times) at bat
• Physics atomic bremsstrahlung
• automated bibliography
• (USA ) Bachelor of Arts (Latin Artium Baccalaureus)
• British vehicle registration for Worcester
• indicating a human blood group containing A and B antigens (see also under ABO)