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n. 1. The act of impropriating; as, the impropriation of property or tithes; also, that which is impropriated. [ 1913 Webster ]

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. [ 1913 Webster ]