insofar as vs since

insofar as

conj

  • to the extent that 

since

conj

  • Because. 

  • From the time that. 

adv

  • From a specified time in the past. 

prep

  • At certain points during that period of time. 

  • Continuously during that period of time. 

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