Source : Webster's Revised Unabridged Dictionary (1913)

Documental \Doc`u*men"tal\, a.
   1. Of or pertaining to instruction. [Obs.] --Dr. H. More.

   2. Of or pertaining to written evidence; documentary; as,
      documental testimony.

Source : WordNet®

documental
     adj : relating to or consisting of or derived from documents [syn:
            {documentary}]