Sensitivity

Noun

1. The quality of being sensitive.
2. The ability of an organism or organ to respond to external stimuli.
• 2013, Fenella Saunders, Tiny Lenses See the Big Picture, The single-imaging optic of the mammalian eye offers some distinct visual advantages. Such lenses can take in photons from a wide range of angles, increasing light sensitivity. They also have high spatial resolution, resolving incoming images in minute detail.
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.