augment vs threefold

augment

verb
  • To add an augment to. 

  • To slow the tempo or meter, e.g. for a dramatic or stately passage. 

  • To increase; to make larger or supplement. 

  • To grow; to increase; to become greater. 

  • To increase an interval, especially the largest interval in a triad, by a half step (chromatic semitone). 

noun
  • In some Indo-European languages, a prefix e- (a- in Sanskrit) indicating a past tense of a verb. 

  • In some Bantu languages, an additional vowel prepended to the noun prefix. 

  • An increase. 

threefold

verb
  • To make threefold; to triple. 

noun
  • An algebraic variety of dimension 3. 

adv
  • by a factor of three 

adj
  • triple 

  • three times as great 

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