As a noun referent
is referee (person who gives a reference).
As an adjective referential is
of a word or phrase applied to a particular person, place, or thing and not to any other.
Other Comparisons: What's the difference?
(semantics) The specific entity in the world that a word or phrase identifies or denotes.
That which is referenced.
* absent referent
Of a word or phrase applied to a particular person, place, or thing and not to any other.
Serving as a reference.
* referential integrity