degradation
n.
1530s, from French dégradation (14c., Old French degradacion), from Medieval Latin degradationem (nominative degradatio), noun of action from past participle stem of degradare (see degrade).
〔蒋〕[grad=step，go，grade步，走，级，-ation名词后缀] 堕落，退化，降级，贬黜