Relational DataBase Management System. A database system in which information is stored in separate tables which can then be related, e.g. a client name and address would be stored once and other files would store a ‘relationship`, such as a client number, in order to retrieve the related information.
Found on http://www.encyclo.co.uk/local/20462
Relational Database Management Systems. A generic term for database products that utilise relational technology. They are characterized by their use of SQL. Examples being Oracle 10G and MS SQL Server. Found on http://www.ft.com/dbglossary