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sen·si·tize / ˈsensiˌtīz/ • v. [tr.] cause (someone or something) to respond to certain stimuli; make sensitive: the introductory section aims to sensitize students to the methodology of the course. ∎  make (photographic film) sensitive to light: the kit sensitizes any 35 mm film in hours. ∎  (often be sensitized to) make (an organism) abnormally sensitive to a foreign substance: the workers had been immunologically sensitized to the enzyme.DERIVATIVES: sen·si·ti·za·tion / ˌsensitiˈzāshən/ n.sen·si·tiz·er n.