Source : Webster's Revised Unabridged Dictionary (1913)

Relational \Re*la"tion*al\ (r?-l?"sh?n-al), a.
   1. Having relation or kindred; related.

            We might be tempted to take these two nations for
            relational stems.                     --Tooke.

   2. Indicating or specifying some relation.

            Relational words, as prepositions, auxiliaries, etc.
                                                  --R. Morris.

Source : WordNet®

relational
     adj : having a relation or being related