Naturalism

n.
  1. A state of nature; conformity to nature.
  2. (Metaph.) The doctrine of those who deny a supernatural agency in the miracles and revelations recorded in the Bible, and in spiritual influences; also, any system of philosophy which refers the phenomena of nature to a blind force or forces acting necessarily or according to fixed laws, excluding origination or direction by one intelligent will.
  3. 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.