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.