convergence vs dispersal

convergence

noun
  • The evolution of similar structures or traits in unrelated species in similar environments; convergent evolution. 

  • A meeting place. 

  • The hypothesis that poorer economies' per capita incomes tend to grow faster than richer economies. 

  • The intersection of three electron beams for red, green and blue onto a single pixel in a CRT. 

  • The coordinated focusing of the eyes, especially at short range. 

  • The merging of distinct technologies, industries, or devices into a unified whole. 

  • The act of moving toward union or uniformity. 

  • The process or property of approaching some limiting value. 

dispersal

noun
  • The act or result of dispersing or scattering; dispersion. 

  • A dispersal prison. 

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