abbreviate vs truncate

abbreviate

verb
  • To make shorter; to shorten (in time); to abridge; to shorten by ending sooner than planned. 

  • To reduce to lower terms, as a fraction. 

  • To reduce a word or phrase by means of contraction or omission to a shorter recognizable form. 

adj
  • Having one part relatively shorter than another or than the ordinary type. 

truncate

verb
  • To shorten (something) by, or as if by, cutting part of it off. 

  • To shorten (a decimal number) by removing trailing (or leading) digits. 

  • To replace a corner by a plane (or to make a similar change to a crystal). 

adj
  • Truncated. 

  • Having an abrupt termination. 

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