Ding an sichPronunciation: /ˌdɪŋ an ˈzɪx, ˌdɪŋ an ˈzɪç/Definition of Ding an sich noun (in Kant’s philosophy) a thing as it is in itself, not mediated through perception by the senses or conceptualization, and therefore unknowable. Origin:GermanDing an sich in other Oxford dictionaries Definition of Ding an sich in the US English dictionary