Webster's English Dictionary

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susceptibility

sus.cep.ti.bil.i.ty \s*-.sep-t*-'bil-*t-e-\ n 1: the quality or state of 
   being susceptible; esp : lack of ability  to resist some extraneous agent 
   (as a pathogen or drug) : SENSITIVITY 2a: a susceptible temperament or 
   constitution  pl  2b: FEELINGS, SENSIBILITIES  3a: the ration of the 
   magnetization in a substance to the corresponding mag netizing force 3b: 
   the ratio of the electric polarization to the electric intensity in a p 
   olarized dielectric