Definitions for thing-in-itself
Random House Webster's College Dictionary
(in Kantian philosophy) reality as it is apart from experience.
Ref: Compare noumenon
Origin of thing-in-itself:
1650–60; trans. of G Ding an sich
the intellectual conception of a thing as it is in itself, not as it is known through perception
In the philosophy of Immanuel Kant (1724-1804) and those whom he influenced, a thing as it is independent of any conceptualization or perception by the human mind, postulated by practical reason but existing in a condition which is in principle unknowable and unexperienceable.
Origin: Literal translation of the German term Ding an sich.
Use the citation below to add this definition to your bibliography:
"thing-in-itself." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/thing-in-itself>.