noun (n)

• the quality of being natural or based on natural principles(noun.attribute)

  Example:
  He accepted the naturalness of death.
  The spontaneous naturalness of his manner.
  

  Antonym:
  unnaturalness
  

  source: wordnet30
• the quality of innocent naivete(noun.attribute)

  Synonym:
  artlessness, ingenuousness, innocence
  

  source: wordnet30
• the likeness of a representation to the thing represented(noun.attribute)

  Example:
  Engineers strove to increase the naturalness of recorded music.
  

  source: wordnet30
• The state or quality of being natural; conformity to nature.(noun)

  source: webster1913