degeneration
Cross references: 1. deterioration de.gen.er.a.tion \di-.jen-*-'ra--sh*n, .de--\ n 1: a lowering of effective power, vitality, or essential quality to an enfe ebled and worsened kind or state 2a: intellectual or moral decline 2b: degenerate condition 3a: progressive deterioration of physical characters from a level represent ing the norm of earlier generations or forms 3b: deterioration of a tissue or an organ in which its vitality is diminish ed or its structure impaired 4: marked decline in excellence (as of workmanship or originality)
Webster's English Dictionary