oneness vs unicity

oneness

noun
  • State of being one or undivided; unity. 

  • The product of being one or undivided. 

unicity

noun
  • The fact of being united as a whole. 

  • The state or quality of being unique or one of a kind. 

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