AB
- (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]
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