airline flight code for Air Canada
• Chem. activated carbon
• Chem. activated charcoal
• Chem. active centre
• Med. acute cholecystitis
• Chem. acyl-oxygen cleavage
• Biochem. adenylate cyclase
• advanced CMOS
• Aero Club
• Air Command
• Air Commodore
• air conditioning
• air control
• Air Corps
• Air Council
• aircraftman
• Alcohol Concern (a charity)
• Alpine Club
• Physics alternating current
• Meteorol. altocumulus
• Ambulance Corps
• analogue computer
• analytical chemist
• angular correlation
• annual conference
• ante Christum (Latin: before Christ)
• Law Appeal Case(s)
• Appeal Court
• appellation contrôlée (see under AOC)
• Army Corps
• Army Council
• artillery college
• Arts Council
• Assistant Commissioner
• Athletic Club
• Atlantic Charter
• Auditor Camerae (Latin: Auditor of the Papal Treasury)
• Azione Cattolica (Italian: Catholic Action; social organization)
• Companion of the Order of Australia
• British vehicle registration for Coventry