Definition of "noun" in English

noun

1. (grammar, strictly) A word that functions as the name of a specific object or set of objects, such as person, animal, place, word, thing, phenomenon, substance, quality, or idea: one of the basic parts of speech in many languages, including English.

2. (grammar, now rare, loosely) Either a word that can be used to refer to a person, animal, place, thing, phenomenon, substance, quality or idea, or a word that modifies or describes a previous word or its referent; a substantive or adjective, sometimes also including other parts of speech such as numeral or pronoun.

3. (computing) An object within a user interface to which a certain action or transformation (i.e., verb) is applied.

verb

1. (transitive) To convert a word to a noun.