(grammar, narrow sense) A word that can be used to refer to a person, animal, place, thing, phenomenon, substance, quality, or idea; one of the basic parts of speech in many languages, including English.
User Defined Definitions
"a content word that can be used to refer to a person, place, thing, quality, or action"
"the word class that can serve as the subject or object of a verb, the object of a preposition, or in apposition"