epidemic vs ubiquitous

epidemic

adj
  • Like or having to do with an epidemic; widespread. 

noun
  • An occurrence of a disease or disorder in a population at a frequency higher than that expected in a given time period; an episode of outbreak and subsequent high prevalence. 

  • A widespread disease that affects many individuals in a population. 

  • The spreading of an idea or belief amongst a population. 

ubiquitous

adj
  • Widespread; very prevalent. 

  • Being everywhere at once: omnipresent. 

  • Appearing to be everywhere at once; being or seeming to be in more than one location at the same time. 

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