sensitivity
n. C / Un. the quality of being easily affected or changed by something, like light, heat, or other people's feelings. It can also mean how well a piece of equipment notices small changes.
n. the capacity of an organism or instrument to respond to external stimuli or signals. In technical contexts, it refers to the degree to which a device or test can detect small amounts of a substance or subtle changes in a condition.
The skin on your face has a high sensitivity to sunlight.
The microphone has high sensitivity, so it picks up even the quietest background noises in the room.
In clinical trials, the sensitivity of a diagnostic test determines its ability to correctly identify patients with the disease, thereby reducing the frequency of false negatives.
From sensitive + -ity.
Uncountable when referring to the general quality of being sensitive; countable when referring to specific physical or emotional triggers.