Definition of: noun

(noun) Gram. noun
1. A word used as the name of a thing, quality, or action existing or conceived by the mind; a substantive. A proper noun is the name of an individual person, place, or thing, as Paul, Nicole, Venice, Rover, U.S.S. Nautilus, etc.; a common noun is the name an individual object has in common with others of its class, as man, city, hill; a collective noun is one expressing a collection or aggregate of individuals, as assembly, army; an abstract noun is one indicating a quality, as goodness, beauty.
2. Anything that can be used as subject, object, or appositive, as a substantive clause.
—adjective Of or pertaining to a noun or nouns: also noun′al. [<AF, OF nun <L nomen name]
—noun′al·ly adverb