infinitesimal vs micro

infinitesimal

adj
  • Very small. 

  • Incalculably, exceedingly, or immeasurably minute; vanishingly small. 

  • Of or pertaining to values that approach zero as a limit. 

noun
  • A non-zero quantity whose magnitude is smaller than any positive number (by definition it is not a real number). 

micro

adj
  • Small, relatively small; used to contrast levels of the noun modified. 

verb
  • to micromanage 

noun
  • a very small person 

  • micromanagement 

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