Source : Free On-Line Dictionary of Computing

ADABAS
     
         A {relational database} system by {Software AG}.
        While it was initially designed for large {IBM} {mainframe}
        systems (e.g. {S/370} in the late 1970s), it has been ported
        to numerous other {platform}s over the last few years such as
        several flavors of {Unix} including {AIX}.
     
        ADABAS stores its data in tables (and is thus "relational")
        but also uses some non-relational techniques, such as
        {multiple value}s and {periodic group}s.
     
        (1995-10-30)