advanced vs simplex

advanced

adj
  • with greater complexity, more difficult 

  • At or close to the state of the art. 

  • Pronounced farther to the front of the vocal tract. 

  • Indicating a time ahead of the correct time. 

  • Having moved forward in time or space (e.g. advanced ignition timing). 

  • In a late stage of development; greatly developed beyond an initial stage. 

simplex

adj
  • Single, simple; not complex. 

  • Unidirectional. 

noun
  • A monomorphemic word, one without affixes. 

  • An analogue in a space of arbitrary dimensionality of the triangle or tetrahedron; the convex hull of n+1 linearly independent points in n-dimensional space; in other words, the triangle, tetrahedron etc., generalized to an arbitrary number of dimensions. 

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