decrement vs diminution

decrement

noun
  • A small quantity removed or lost. One of a series of regular subtractions. 

verb
  • To decrease a value by a basic quantity unit. 

diminution

noun
  • A lessening, decrease or reduction. 

  • a compositional technique where the composer shortens the melody by shortening its note values. 

  • The act or process of making diminutive. 

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