centenarian vs centenary

centenarian

adj
  • Aged 100 years or more; extremely old. 

  • Of or relating to centenarians or a centenary celebration. 

noun
  • One who or that which is at least 100 years old. 

centenary

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

  • Occurring every 100 years. 

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

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

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

  • Synonym of centennial: a hundredth anniversary. 

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