premunition
noun
pre·mu·ni·tion ˌprē-myu̇-ˈni-shən 
1
archaic : an advance provision of protection
2
a
: resistance to a disease due to the existence of its causative agent in a state of physiological equilibrium in the host
b
: immunity to a particular infection due to previous presence of the causative agent
Word History
Etymology
Latin praemunition-, praemunitio strengthening of an argument to forestall objections, from praemunire to fortify in advance, from prae- + munire to fortify — more at munition
First Known Use
1607, in the meaning defined at sense 1
Medical Definition
premunition
noun
pre·mu·ni·tion ˌprē-myu̇-ˈnish-ən
1
: resistance to a disease due to the existence of its causative agent in a state of physiological equilibrium in the host
2
: immunity to a particular infection due to previous presence of the causative agent