n. the death of cells (e.g., neurons, muscle cells) from any of a variety of causes, including disease, injury, toxins, and obstruction of blood supply to an affected body part. —necroticadj.
the principle that the change in strength of an association during learning is a function of the difference between the maximal strength possible and the current strength of the association. The delta rule is used in associationistic learning theory (see associative learning).