susceptibility

noun5

1. •
   The condition of being susceptible; vulnerability.

   • It has been reported that periparturient cows undergo a period of immunosuppression of various immunological parameters associated with a high susceptibility to uterine and mammary infections […] — 2015
2. •
   A way in which one is susceptible.
3. •
   Being vulnerable to a treatment (usually an antibiotic or antifungal); also, the degree of such vulnerability (i.e., weak, moderate, or strong).
4. •
   emotional sensitivity.

   • 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
5. •
   electric susceptibility, a measure of how easily a dielectric polarizes in response to an external electric field (compare permittivity).