deliquium vs syncopation

deliquium

noun
  • An abrupt loss of consciousness usually caused by an insufficient blood flow to the brain; fainting. 

  • Liquefaction through absorption of moisture from the air. 

  • A languid, maudlin mood. 

  • An abrupt absence of sunlight, e.g. caused by an eclipse. 

syncopation

noun
  • The contraction of a word by means of loss or omission of sounds or syllables in the middle thereof. 

  • The quality of a rhythm being somehow unexpected, in that it deviates from the strict succession of regularly spaced strong and weak beats in a meter. 

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