declension [declensions](way of categorizing) noun [UK: dɪ.ˈklen.ʃn̩] [US: dɪ.ˈklen.ʃn̩]In Latin there are five declensions. = Il latino ha cinque declinazioni.
declination [declinations](at a given point, the angle between magnetic north and true north) noun [UK: ˌde.klɪ.ˈneɪʃ.n̩] [US: ˌde.klɪ.ˈneɪʃ.n̩]