dilate vs widen

dilate

verb
  • To become wider or larger; to expand. 

  • To speak largely and copiously; to dwell in narration; to enlarge; with "on" or "upon". 

  • To enlarge; to make bigger. 

  • To use a dilator to widen (something, such as a vagina). 

widen

verb
  • To become wide or wider. 

  • To make wide or wider. 

  • To convert to a data type that can hold a larger number of distinct values. 

  • To broaden or extend in scope or range. 

  • To let out clothes to a larger size. 

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