I. noun Date: 1927 the one of the four ~O blood groups characterized by the presence of antigens designated by the letters A and B and by the absence of antibodies against these antigens, II. abbreviation able-bodied seaman, airborne, airman basic, Alberta, bachelor of arts
AB
Meaning of AB in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012