different between variolation vs ariolation

English

variola +? -ation

variolation (countable and uncountable, plural variolations)

(historical) The inoculation of a person with smallpox so as to induce a mild form of the illness and subsequent immunity to it.

From (the stem of) Latin ariolari, hariolari, from hariolus (“soothsayer”) +? -ation.

ariolation (uncountable)

(obsolete) Soothsaying; prophecy.
- 1646, Thomas Browne, Pseudodoxia Epidemica, I.3:
  Thus the Priests of Elder time, have put upon them many incredible conceits, […] deluding their apprehensions with Ariolation, South saying, and such oblick Idolatries […]

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