decenary vs frankpledge

decenary

noun
  • A tithing. 

adj
  • Of or related to a tithing. 

  • Of or related to the number ten, (particularly) as a base of numeration. 

  • Containing or comprising ten items or units. 

frankpledge

noun
  • The tithing itself. 

  • A decener: a member of a tithing bound in frankpledge. 

  • Any group so similarly answerable for the conduct of all its members and liable for collective punishment. 

  • A form of collective suretyship and punishment under English law among the members of a tithing. 

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