threefold vs thricely

threefold

adv

  • by a factor of three 

verb

  • To make threefold; to triple. 

noun

  • An algebraic variety of dimension 3. 

adj

  • triple 

  • three times as great 

thricely

adv

  • thrice; three times. 

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