centennial vs routine

centennial

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. 

noun
  • The hundredth anniversary of an event or happening. 

routine

noun
  • A course of action to be followed regularly; a standard procedure. 

  • A set piece of an entertainer's act. 

  • A set of normal procedures, often performed mechanically. 

  • A set of instructions designed to perform a specific task; a subroutine. 

adj
  • Ordinary with nothing to distinguish it from all the others. 

  • According to established procedure. 

  • Regular; habitual. 

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