Medical Definition of susceptibility
1: the quality or state of being susceptible : the state of being predisposed to, sensitive to, or of lacking the ability to resist something (as a pathogen, familial disease, or a drug) : sensitivity
2a: the ratio of the magnetization in a substance to the corresponding magnetizing force—see paramagneticb: the ratio of the electric polarization to the electric intensity in a polarized dielectric
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