\Im*pro`pri*a"tion\, n.
1. The act of impropriating; as, the impropriation of
   property or tithes; also, that which is impropriated.

2. (Eng. Eccl. Law)
   (a) The act of putting an ecclesiastical benefice in the
       hands of a layman, or lay corporation.
   (b) A benefice in the hands of a layman, or of a lay
       corporation.