thing-in-itself

noun

thing-in-it·​self ˈthiŋ-in-it-ˈself 

plural things-in-themselves ˈthiŋz-in-t͟həm-ˈselvz 

-t͟hem-

: noumenon

Word History

Etymology

translation of German Ding an sich

First Known Use

1739, in the meaning defined above