incurvature vs trajectory

incurvature

noun
  • curvature; curving 

trajectory

noun
  • The path of a body as it travels through space. 

  • The ordered set of intermediate states assumed by a dynamical system as a result of time evolution. 

  • The path an object takes as it moves. 

  • A course of development, such as that of a war or career. 

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