The Collaborative International Dictionary of English v.0.48:

Impetrate \Im"pe*trate\, a. [L. impetratus, p. p. of impetrare
   to obtain; pref. im- in + patrare to bring to pass.]
   Obtained by entreaty. [Obs.] --Ld. Herbert.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Impetrate \Im"pe*trate\, v. t. [imp. & p. p. Impetrated; p.
   pr. & vb. n. Impetrating.]
   To obtain by request or entreaty. --Usher.
   [1913 Webster]