circa vs much

circa

prep
  • Approximately, about, around (typically in relation to time) 

much

det
  • Many ( + plural countable noun). 

  • A large amount of. 

  • Used to indicate, demonstrate or compare the quantity of something. 

adv
  • Often; frequently. 

  • Used to indicate or compare extent. 

  • To a great extent. 

pron
  • A large amount or great extent. 

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