city vs oppidan

city

noun
  • A large settlement, bigger than a town; sometimes with a specific legal definition, depending on the place. 

  • A settlement granted special status by royal charter or letters patent; traditionally, a settlement with a cathedral regardless of size. 

  • A large amount of something (used after the noun). 

  • The central business district; downtown. 

oppidan

adj
  • Of or pertaining to a town or conurbation. 

noun
  • A class of student in traditional English public schools such as Eton; opposed to colleger or King's Scholar. 

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