Noumenon

n.

1.

(Metaph.) The of itself unknown and unknowable rational object, or thing in itself, which is distinguished from the phenomenon through which it is apprehended by the senses, and by which it is interpreted and understood; - so used in the philosophy of Kant and his followers.

Noun

1.

noumenon - the intellectual conception of a thing as it is in itself, not as it is known through perception Synonyms: thing-in-itself

cognitive content, content, mental object, thing-in-itself