• (formerly) astatine. Symbol: Ab
  • antibody
  • able seaman
  • airborne
  • Airman Basic
  • Alberta, Canada (approved for postal use)
  • antiballistic; antiballistic missile
  • major blood group usually enabling a person whose blood is of this type to donate blood to persons of type AB and to receive blood from persons of type O, A, B, or AB
  • abdominal muscles
  • the 11th month of the civil year or the 5th month of the ecclesiastical year in the Jewish calendar see month table
  • an abdominal muscle [n ABS]