The Collaborative International Dictionary of English v.0.48:

Exauthorate \Ex*au"thor*ate\, v. t. [L. exauctoratus, p. p. of
   exauctorare to dismiss; ex out + auctorare to bind to
   something, to hire, fr. auctor. See Author.]
   To deprive of authority or office; to depose; to discharge.
   [Obs.]
   [1913 Webster]

         Exauthorated for their unworthiness.     --Jer. Taylor.
   [1913 Webster]