Source : Webster's Revised Unabridged Dictionary (1913)

Impropriate \Im*pro"pri*ate\, v. t. [imp. & p. p.
   {Impropriated}; p. pr. & vb. n. {Impropriating}.] [Pref. im-
   in + L. propriatus, p. p. of propriare to appropriate. See
   {Appropriate}.]
   1. To appropriate to one's self; to assume. [Obs.]

            To impropriate the thanks to himself. --Bacon.

   2. (Eng. Eccl. Law) To place the profits of (ecclesiastical
      property) in the hands of a layman for care and
      disbursement.