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Definition of Thing-in-itself
1. Noun. The intellectual conception of a thing as it is in itself, not as it is known through perception.
Definition of Thing-in-itself
1. Noun. (philosophy) 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. ¹
¹ Source: wiktionary.com