The Collaborative International Dictionary of English v.0.48:

Directorial \Di*rec*to"ri*al\, a. [Cf. F. directorial.]
   1. Having the quality of a director, or authoritative guide;
      directive.
      [1913 Webster]

   2. Pertaining to: director or directory; specifically,
      relating to the Directory of France under the first
      republic. See Directory, 3.
      [1913 Webster]

            Whoever goes to the directorial presence under this
            passport.                             --Burke.
      [1913 Webster]