different between immunity vs variolation

English

From Old French immunité, from Latin immunitas, in the legal sense; for the medical use see immunization.

immunity (countable and uncountable, plural immunities)

(uncountable) The state of being insusceptible to something; notably:
1. (medicine) Fully protective resistance against infection.
2. (law) An exemption from specified duties, such as payments or services.
3. (law) An exemption from prosecution.
4. (in games and competitions) An exemption given to a player from losing or being withdrawn from play.
(countable) A resistance to a specific thing.

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.

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