The Collaborative International Dictionary of English v.0.48:

Imperate \Im"pe*rate\, a. [L. imperatus, p. p. of imperare to
   command.]
   Done by express direction; not involuntary; communded. [Obs.]
   [1913 Webster]

         Those imperate acts, wherein we see the empire of the
         soul.                                    --Sir M. Hale.
   [1913 Webster]