John Walker in 1802 from vacciolate + -ion. <span class="searchmatch">vacciolation</span> (countable and uncountable, plural <span class="searchmatch">vacciolations</span>) Innoculation with cowpox (the vacciolous virus)...
<span class="searchmatch">vacciolations</span> plural of <span class="searchmatch">vacciolation</span>...
tenth, and twelfth days I Saw their arms, and was well satisfied that <span class="searchmatch">vacciolation</span> had taken place. 1804, John Feltham, The Picture of London, for 1804...