noun
In philosophy, a thing as it is in itself, as distinct from a thing as it is known through perception
adjective
Relating to a thing as it is in itself, independent of any perception or experience
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The concept of noumenon in Kantian philosophy refers to things as they are in themselves, beyond our sensory perception.
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I don't really understand the whole noumenon thing, it's too abstract for me.
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Noumenon is like the ultimate reality behind everything, man.
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The artist aimed to capture the noumenon of human emotion in her abstract paintings.