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noumenon

noumenon A noumenon is an object understood by pure thought rather than by the senses.

A noumenon is an object understood by pure thought rather than by the senses. In this historical usage, especially in Kant, it refers to the thing as not given in sensory experience and so only thinkable, in contrast with a phenomenon.

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Sources

Drafting source: Baldwin Dictionary of Philosophy and Psychology, 1901. 1901 New York Macmillan original; archive index checked 2026-10-18. “Noumenon” (Noumenon).
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PsychTerms (psychterms.org), CC BY 4.0, version 1. “noumenon.” Development preview.

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