Source : Webster's Revised Unabridged Dictionary (1913)

Susceptibility \Sus*cep`ti*bil"i*ty\, n.; pl.
   {Susceptibilities}. [Cf. F. susceptibilit['e].]
   1. The state or quality of being susceptible; the capability
      of receiving impressions, or of being affected.

   2. Specifically, capacity for deep feeling or emotional
      excitement; sensibility, in its broadest acceptation;
      impressibility; sensitiveness.

   {Magnetic susceptibility} (Physics), the intensity of
      magnetization of a body placed in a uniform megnetic field
      of unit strength. --Sir W. Thomson.

   Syn: Capability; sensibility; feeling; emotion.

Source : WordNet®

susceptibility
     n : the state of being susceptible; easily affected [syn: {susceptibleness}]
         [ant: {unsusceptibility}]