1.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.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.An object within a user interface to which a certain action or transformation (i.e., verb) is applied.
1.A noun or word group that functions as part of a noun phrase.
2.A part of speech that shares features with nouns and adjectives. (Depending on the language, it may comprise nouns, adjectives, possibly numerals, pronouns, and participles.)
3.A number (usually natural) used like a name; a numeric code or identifier. (See nominal number on Wikipedia.)