inunctionPronunciation: /ɪˈnʌŋ(k)ʃ(ə)n/Definition of inunction noun [mass noun] chiefly Medicine the rubbing of ointment or oil into the skin. Origin: late 15th century: from Latin inunctio(n-), from inunguere 'smear on'inunction in other Oxford dictionaries Definition of inunction in the US English dictionary