Definition of "susceptibility"

susceptibility

/səˌsɛptəˈbɪlɪti/

noun
countable and uncountable, plural susceptibilities
1. the condition of being susceptible; vulnerability
2. emotional sensitivity.
  Quotations
  The eyes were large and black, and had the moonlight's melancholy, with that tearful lustre which is the certain sign of keen susceptibility.
  1837, L[etitia] E[lizabeth] L[andon], “Anticipation”, in Ethel Churchill: Or, The Two Brides. […], volume I, London: Henry Colburn, […], page 40
3. (biology, medicine, of a pathogen) Being vulnerable to a treatment (usually an antibiotic or antifungal); also, the degree of such vulnerability (i.e., weak, moderate, or strong).
4. (physics) electric susceptibility, a measure of how easily a dielectric polarizes in response to an external electric field (compare permittivity).