able-bodied seaman
• Bachelor of Arts
• British fishing port registration for Ballantrae
• Finance bank (or banker's) acceptance
• postcode for Bath
• Med. biliary atresia
• (ital.) (USA ) Biological Abstracts (publication)
• Board of Agriculture
• Booksellers' Association (of Great Britain and Ireland)
• Chem. boric acid
• British Academy
• British Airways
• British America
• British Association (for the Advancement of Science)
• British Association (pitch of screw thread, as in 4BA )
• bronchial asthma
• Buenos Aires
• Computing bus automaton
• British vehicle registration for Manchester