1. A content word that can be used to refer to a person, place, thing, quality, or action
   "'Teacher', 'Paris', and 'kindness' are all nouns"
    
2. The word class that can serve as the subject or object of a verb, the object of a preposition, or in apposition
   "'Cat' and 'happiness' are examples of nouns"

Derived forms: nouns

Type of: content word, major form class, open-class word, substantive

Part of: declension [archaic]

Encyclopedia: Noun