The process or condition of becoming worse. [L. deterior, worse]
- alcoholic d. dementia occurring in persons chronically addicted to alcohol. See chronic alcoholism.
- senile d. a slowly progressing decline in physical and mental health, apparently due to natural causes attendant upon the processes of aging. See Alzheimer disease.

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de·te·ri·o·ra·tion di-.tir-ē-ə-'rā-shən n the action or process of deteriorating: the state of having deteriorated <personality \deterioration> <neurological \deterioration>

Medical dictionary. 2011.