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: Webster's Revised Unabridged Dictionary (1913)