sensitivity UK /ˌsɛn.sɪˈtɪv.ɪ.ti/US /ˌsɛn.səˈtɪv.ə.ti/ noun7 •The quality or state of being sensitive; sensitiveness. •The ability of an organism or organ to respond to external stimuli. •The degree of response of an instrument to a change in an input signal. •The rate at which the player's facing direction or position changes relative to input device movement.Since he played with high sensitivity, he only needed to move the mouse a tiny distance to rotate a full 360 degrees. •The degree of response of a film etc. to light of a specified wavelength. •Vulnerability to medical treatment: Synonym of susceptibility. •The probability, in a binary classification test, of a true positive being correctly identified. formssensitivities