WordReference Random House Unabridged Dictionary of American English © 2026
nou•me•non
(no̅o̅′mə non′),USA pronunciation n., pl. -na (-nə).USA pronunciation
- Philosophythe object, itself inaccessible to experience, to which a phenomenon is referred for the basis or cause of its sense content.
- Philosophya thing in itself, as distinguished from a phenomenon or thing as it appears.
- Philosophy[Kantianism.]something that can be the object only of a purely intellectual, nonsensuous intuition.
- Greek nooúmenon a thing being perceived, noun, nominal use of neuter of present participle passive of noeîn to perceive; akin to nous
- 1790–1800
'noumenon' also found in these entries (note: many are not synonyms or translations):