A Sensitivity

1. The quality or state of being sensitive; sensitiveness.
2. The ability of an organism or organ to respond to external stimuli.
3. (statistics) The proportion of individuals in a population that will be correctly identified in a binary classification test.
4. (electronics) The degree of response of an instrument to a change in an input signal.
5. (photography) The degree of response of a film etc. to light of a specified wavelength.