configuration vs undirected graph

configuration

noun
  • A finite set of points and lines (and sometimes planes), generally with equal numbers of points per line and equal numbers of lines per point. 

  • Relative position or aspect of the planets; the face of the horoscope, according to the relative positions of the planets at any time. 

  • The way things are arranged or put together in order to achieve a result. 

  • Form, as depending on the relative disposition of the parts of a thing's shape; figure; form factor. 

  • The arrangement of electrons in an atom, molecule, or other physical structure like a crystal. 

undirected graph

noun
  • A graph in which the edges are not ordered, so the edge (a, b) is identical to the edge (b, a). 

How often have the words configuration and undirected graph occurred in a corpus of books? (source: Google Ngram Viewer )