septenarius vs septenary

septenarius

noun
  • A verse having seven metrical feet. 

septenary

noun
  • The seven notes of the diatonic scale. 

  • A group of seven things. 

  • A period of seven years. 

adj
  • Of seventh rank or order. 

  • Consisting of or containing seven. 

  • Lasting seven years; continuing seven years. 

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