peculiarity vs unicity

peculiarity

noun
  • The quality or state of being peculiar; individuality; singularity. 

  • Exclusive possession or right. 

  • That which is peculiar; a special and distinctive characteristic or habit; particularity. 

unicity

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

  • The fact of being united as a whole. 

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