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n. Sensitivity or responsiveness to light.

n. Medicine An abnormally heightened response, especially of the skin, to sunlight or ultraviolet radiation, caused by certain disorders or chemicals and characterized by a toxic or allergic reaction.

n. sensitivity to light, especially a heightened response to light

n. sensitivity to the action of radiant energy

"In addition, the material demonstrates good photosensitivity, meaning it reacts sensitively to laser light, which may enable lower power lasers to be used to scan the disk."

sensibility    sensitivity    sensitiveness