Source : Free On-Line Dictionary of Computing

repeating group
     
         Any {attribute} that can have multiple values
        associated with a single instance of some {entity}.  For
        example, a book might have multiple authors.
     
        In order to represent such a relationship in a {relational
        database}, it would be converted to "first normal form" as the
        first step in {database normalisation}.  Each author of the
        book would then appear in a separate {row}, each of which also
        contained the book's {primary key}.
     
        (2001-04-10)