The Collaborative International Dictionary of English v.0.48:

Referential \Ref`er*en"tial\ (-shal), a.
   Containing a reference; pointing to something out of itself;
   as, notes for referential use. -- Ref`er*en"tial*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

referential
    adj 1: referring or pointing to something; "symbols are
           inherently referential"

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "referential":
   allegorical, allusive, allusory, associational, connotational,
   connotative, definable, denotational, denotative, expressive,
   extended, extensional, figurative, figured, flowery,
   full of meaning, full of point, full of substance, implicational,
   implicative, implicatory, indicative, inferential, insinuating,
   insinuative, insinuatory, intelligible, intensional, interpretable,
   ironic, mannered, meaning, meaningful, meaty, metaphorical,
   ornamented, pithy, pointed, pregnant, readable, sententious,
   significant, significative, substantial, suggestive, symbolic,
   transferred, trolatitious, tropological