quotidian vs two a penny

quotidian

adj
  • Having the characteristics of something which can be seen, experienced, etc, every day or very commonly; commonplace, ordinary, mundane. 

  • Recurring every twenty-four hours or (more generally) daily (of symptoms, etc). 

  • Happening every day; daily. 

noun
  • Commonplace or mundane things regarded as a class. 

  • A daily allowance formerly paid to certain members of the clergy. 

two a penny

adj
  • very common; cheap 

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