Definition: noun

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Source: WordNet (r) 1.7 

noun
     n 1: a word that can be used to refer to a person or place or
          thing
     2: a word that can serve as the subject or object of a verb

Source: Webster's Revised Unabridged Dictionary (1913) 

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.

   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.