epitome vs one in a million

epitome

noun
  • The embodiment or encapsulation of a class of items. 

  • A representative example. 

  • A brief summary of a text. 

  • The height; the best; the most vivid. 

one in a million

noun
  • Something extremely rare or unlikely. 

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