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The Thing-in-itself (n.) cannot ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠be cognized but must be thinkable; otherwise there would be appearance without anything that appears.

Definition.com

The Thing-in-itself (n.) would ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠be nothing for me if given without any reference to possible experience — like stars no one will ever see.

Definition.com

The Thing-in-itself (n.) stays ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠unknown to me, and I do not need to know it, since a thing can never come before me except in appearance.

Definition.com

The Thing-in-itself (n.) could ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠never be intuited even when present — its properties cannot migrate over into my power of representation.

Definition.com

The Thing-in-itself (n.) thought ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠rigorously is an object that is no object for us — one that would stand without the 'ob-' that sets it before us.

Definition.com

Thing-in-itself (n.) cannot ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠be proven to have magnitude, degree, or substance; only as objects of experience are all things subject a priori to these conditions.

Definition.com

The Thing-in-itself (n.) can ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠never be cognized — yet it would be an even greater absurdity to allow none at all, as if our way of knowing were the only possible one.

Definition.com

The Thing-in-itself (n.) could ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠never be known a priori if it were what our cognition dealt with: concepts taken from it would be empirical, and concepts taken from ourselves could not determine it.

Definition.com

The Thing-in-itself (n.) in ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the merely physical sense is the rain behind the rainbow; in the transcendental sense even the rain is appearance, and the thing in itself remains unknown.

Definition.com

The Thing-in-itself (n.) causes ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the sense-data yet can never be known by science, which is bound within subjectivity: the ultimate conditions of objective knowledge are not objectively knowable.

Definition.com

Thing-in-itself (n.) do ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠not conform to my understanding; my understanding would have to conform to them — and then nothing about them could be known a priori.

Definition.com

The Thing-in-itself (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠what we believe we cognize when we take the merely empirical distinction between essential and contingent features for the transcendental one — though we deal with nothing but appearances, even in the deepest research.