n. Gradual ruin or decay; disorder; especially, impairment or ruin through misuse or neglect.n. Specifically In English ecclesiastical law, the pulling down, suffering to go to decay, or ruin of any building or other property in possession of an incumbent.n. In ecclesiastical law, the amount charged against an incumbent for damages incurred during his incumbency.n. In geology, the process by which exposed ledges become diminished or destroyed through the falling away of fragments of rock; also, the material broken off.