leash vs ternion

leash

noun
  • A group of three 

  • A string with a loop at the end for lifting warp threads, in a loom. 

  • A brace and a half; a tierce. 

  • A set of three animals (especially greyhounds, foxes, bucks, and hares;) 

  • A strap, cord or rope with which to restrain an animal, often a dog. 

  • A leg rope. 

verb
  • To fasten or secure with a leash. 

  • to curb, restrain 

ternion

noun
  • The number three; three things together; a ternary or triplet. 

  • A section of paper for a book containing three double leaves or twelve pages. 

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