de·te·ri·o·ra·tion 
/dɪˌtirijəˈreɪʃən/ noun
/dɪˌtirijəˈreɪʃən/ noun [singular] : the act or process of becoming worse
▪ economic deterioration ▪ the gradual deterioration of the weather ▪ a deterioration of academic standards ▪ a deterioration in quality
▪ economic deterioration ▪ the gradual deterioration of the weather ▪ a deterioration of academic standards ▪ a deterioration in quality
