noun (n)

• (philosophy) the doctrine that the world can be understood in scientific terms without recourse to spiritual or supernatural explanations(noun.cognition)

  source: wordnet30
• an artistic movement in 19th century France; artists and writers strove for detailed realistic and factual description(noun.group)

  Synonym:
  realism
  

  source: wordnet30
• A state of nature; conformity to nature.(noun)

  source: webster1913
• The theory that art or literature should conform to nature; realism; also, the quality, rendering, or expression of art or literature executed according to this theory.(noun)

  source: webster1913