To inject a person with a vaccine to help their body build immunity against a specific disease.
From Latin 'vacca' meaning 'cow,' because Edward Jenner discovered in 1796 that exposing people to cowpox (a mild disease from cows) protected them from deadly smallpox. The '-ate' suffix makes it a verb.
Edward Jenner named his procedure 'vaccination' from the Latin word for cow as a tribute to the animal that inspired his breakthrough—it's one of history's most successful medical discoveries, yet it comes from an accidental observation of milkmaids who never got smallpox!
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