burgomaster vs centenary

burgomaster

noun
  • The mayor, or head magistrate, of a town in the Netherlands, Belgium, Germany and certain other countries. 

centenary

noun
  • Synonym of centgrave: a position in the Frankish Empire overseeing local administration. 

  • Synonym of hundredman: a position in the Anglo-Saxon kingdoms overseeing local administration. 

  • Synonym of hundredweight, especially (historical) in Greek and Roman contexts. 

  • Synonym of centennial: a hundredth anniversary. 

adj
  • Occurring every 100 years. 

  • Lasting or aged 100 years, 100-year-old. 

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