DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   AB
       n 1: a bachelor's degree in arts and sciences [syn: Bachelor of
    Arts, BA, Artium Baccalaurens, AB]
       2: the eleventh month of the civil year; the fifth month of the
          ecclesiastical year in the Jewish calendar (in July and
          August) [syn: Ab, Av]
       3: the muscles of the abdomen [syn: abdominal, abdominal
    muscle, ab]
       4: the blood group whose red cells carry both the A and B
          antigens [syn: AB, type AB, group AB]