(1) In the DCE X/Open Directory Service (XDS), a set of Attribute Value Assertions (AVAs), each of which is true, concerning the distinguished values of a particular entry.
(2) The part of an object name that is an attribute of the object itself.
(3) The first component of the distinguished name (DN). For example, if the entry's DN is cn=John Doe,ou=Test,o=IBM,c=US, the RDN is cn=John Doe.