[pre.mu.ni.tion] n [L praemunition-, praemunitio advance fortification, fr. praemunire to fortify in advance, fr. prae- + munire to fortify--more at munition] (1607) 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