motility vs progression

motility

noun
  • The state of being motile (moving) 

  • The degree to which something is motile 

progression

noun
  • The act of moving from one thing to another. 

  • A sequence obtained by adding or multiplying each term by a constant. 

  • chord progression 

  • The act of moving forward or proceeding in a course; motion onward. 

  • Development, increase, evolution. 

  • The making an exercise more exerting by manipulating the details of its performance like loaded weight, range of motion, angle, speed. 

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