nou·me·non (no?o?m?-n?n?)n. pl. nou·me·na (-n?) In the philosophy of Kant, an object as it is in itself independent of the mind, as opposed to a phenomenon. Also called thing-in-itself.[German, from Greek nooumenon, from neuter present passive participle of noein, to perceive by thought, from nous, mind.]nou?men·al (-m?-n?l) adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.noumenon (?nu?m?n?n; ?na?-) n, pl -na (-n?) 1. (Philosophy) (in the philosophy of Kant) a thing as it is in itself, not perceived or interpreted, incapable of being known, but only inferred from the nature of experience. Compare phenomenon3 See also thing-in-itself2. (Philosophy) the object of a purely intellectual intuition[C18: via German from Greek: thing being thought of, from noein to think, perceive; related to nous mind] ?noumenal adj ?noumenalism n ?noumenalist n, adj ?noume?nality n ?noumenally advCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014nou?me?non (?nu m??n?n) n., pl. -na (-n?). something that can be the object only of a purely intellectual, nonsensuous intuition. [1790?1800;