ternion vs three

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. 

three

noun
  • Anything measuring three units, as length. 

  • Three o'clock, either a.m. or p.m. 

  • A person who is three years old. 

  • The playing card featuring three pips. 

  • The digit/figure 3. 

num
  • A numerical value after two and before four. Represented in Arabic digits as 3; this many dots (•••). 

  • Describing a set or group with three elements. 

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