declension
n.
mid-15c., ultimately from Latin declinationem (nominative declinatio), noun of action from past participle stem of declinare (see decline, v.); perhaps via French; "the form is irregular, and its history obscure" [OED].
〔蒋〕[de-加强意义，clen=clin倾，-sion抽象名词后缀] 倾斜，下倾，衰落