noun Meaning, Definition & Usage

  1. noun a content word that can be used to refer to a person, place, thing, quality, or action
  2. noun the word class that can serve as the subject or object of a verb, the object of a preposition, or in apposition

WordNet

Noun noun
Etymology
OF. noun, nun, num, non, nom, F. nom, fr. L. nomen name. See Name.
Definitions
  1. (Gram.) A word used as the designation or appellation of a creature or thing, existing in fact or in thought; a substantive. ✍ By some grammarians the term noun is so used as to include adjectives, as being descriptive; but in general it is limited to substantives.

Webster 1913