Source : Webster's Revised Unabridged Dictionary (1913)

Sensitivity \Sen`si*tiv"i*ty\, n.
   The quality or state of being sensitive; -- used chiefly in
   science and the arts; as, the sensitivity of iodized silver.

         Sensitivity and emotivity have also been used as the
         scientific term for the capacity of feeling. --Hickok.

Source : WordNet®

sensitivity
     n 1: (physiology) responsiveness to external stimuli;
          "sensitivity to pain" [syn: {sensitiveness}, {sensibility}]
     2: the ability to respond to physical stimuli or to register
        small physical amounts or differences; "a galvanometer of
        extreme sensitivity"
     3: sensitivity to emotional feelings (of self and others) [syn:
         {sensitiveness}]
     4: susceptibility to a pathogen [syn: {predisposition}]
     5: the ability to respond to affective changes in your
        interpersonal environment [syn: {sensitiveness}] [ant: {insensitivity},
         {insensitivity}]