Sensitivity

The quality or state of being sensitive; -- used chiefly in science and the arts; as, the sensitivity of iodized silver.

(physiology) responsiveness to external stimuli; the faculty of sensation; "sensitivity to pain"

sensitivity to emotional feelings (of self and others)

the ability to respond to affective changes in your interpersonal environment

the ability to respond to physical stimuli or to register small physical amounts or differences; "a galvanometer of extreme sensitivity"; "the sensitiveness of Mimosa leaves does not depend on a change of growth"

susceptibility to a pathogen