Source : Webster's Revised Unabridged Dictionary (1913)

Authorial \Au*tho"ri*al\, a.
   Of or pertaining to an author. ``The authorial ?we.'''
   --Hare.

Source : WordNet®

authorial
     adj : of or by or typical of an author; "authorial comments";
           "auctorial flights of imagination" [syn: {auctorial}]