Definition of "Sensitivity" :

noun: the ability to respond to affective changes in your interpersonal environment

noun: the ability to respond to physical stimuli or to register small physical amounts or differences

"A galvanometer of extreme sensitivity."

noun: (physiology) responsiveness to external stimuli; the faculty of sensation

"Sensitivity to pain."

noun: sensitivity to emotional feelings (of self and others)

noun: susceptibility to a pathogen