centennial vs expo

centennial

noun
  • The hundredth anniversary of an event or happening. 

adj
  • Relating to, or associated with, the commemoration of an event that happened a hundred years before. 

  • Happening once in a hundred years. 

  • Lasting or aged a hundred years. 

expo

noun
  • An exposition. 

  • An expediter; a restaurant worker who prepares food to be taken to tables. 

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