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From The Collaborative International Dictionary of English v.0.48:
Noun \Noun\ (noun), n. [OF. noun, nun, num, non, nom, F. nom, fr. L. nomen name. See Name.] (Gram.) A word used as the designation or appellation of a creature or thing, existing in fact or in thought; a substantive. [1913 Webster] Note: By some grammarians the term noun is so used as to include adjectives, as being descriptive; but in general it is limited to substantives. [1913 Webster]