The Free On-line Dictionary of Computing (30 December 2018):

referential integrity

    A collection of properties which should be
   possessed by data in a relational database.

   For example, in a database of family members, if we enter A as
   a spouse of B, we should also enter B as a spouse of A.
   Similarly, if we remove one end of the relationship we should
   also remove the other.

   (1998-02-18)