blackball vs inclusion

blackball

verb
  • To ostracize. 

  • To vote against, especially in an exclusive organization. 

noun
  • A black ball used to indicate such a negative vote. 

  • A rejection; a vote against admitting someone. 

  • A kind of large black sweet; a niggerball. 

  • A game, a standardized version of the English version of eight-ball. 

  • A substance for blacking shoes, boots, etc. or for taking impressions of engraved work. 

inclusion

noun
  • A mapping where the domain is a subset of the image. 

  • Anything foreign that is included in a material, 

  • The act of including, i.e. adding or annexing, (something) to a group, set, or total. 

  • Any material that is trapped inside a mineral during its formation, as a defect in a precious stone. 

  • A nuclear or cytoplasmic aggregate of stainable substances. 

  • An addition or annex to a group, set, or total. 

  • An object completely inside a tissue, such as epidermal inclusion cyst, a cyst in the epidermis. 

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