threefold vs trine

threefold

adj
  • triple 

  • three times as great 

verb
  • To make threefold; to triple. 

adv
  • by a factor of three 

noun
  • An algebraic variety of dimension 3. 

trine

adj
  • Triple; threefold. 

  • Denoting the aspect of two celestial bodies which are 120° apart. 

verb
  • To put in the aspect of a trine. 

noun
  • A group of three things. 

  • An aspect of two astrological bodies when 120° apart. 

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