connote vs signify

connote

verb
  • To require as a logical predicate to consequence. 

  • To possess an inseparable related condition; to imply as a logical consequence. 

  • To signify beyond its literal or principal meaning. 

  • To express without overt reference; to imply. 

signify

verb
  • To make a difference; to matter (in negative or interrogative expressions). 

  • To show one’s intentions with a sign etc.; to indicate, announce. 

  • To mean; to betoken. 

  • To create a sign out of something. 

  • To give (something) a meaning or an importance. 

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