Definition of degeneration noun from the Oxford Advanced American Dictionary

 

degeneration

 noun
noun
NAmE//dɪˌdʒɛnəˈreɪʃn//
 
[uncountable]
 
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the process of becoming worse or less acceptable in quality or condition social/moral degeneration Intensive farming in the area has caused severe degeneration of the land. Speech degeneration often occurs in children who become deaf after acquiring language.
See the Oxford Advanced Learner's Dictionary entry: degeneration