Variolation Definition
    noun
  
 (historical) The inoculation of a person with smallpox so as to induce a mild form of the illness and subsequent immunity to it.
Wiktionary 
Synonyms: 
  Other Word Forms of Variolation
Noun
Singular:
 variolationPlural:
 variolationsOrigin of Variolation
-  Compare variola, -ation. From Wiktionary 
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