To make someone or something more aware of or responsive to certain stimuli or issues. The campaign aims to sensitise the public to the dangers of smoking.
To make a material or surface more sensitive to light or other forms of energy. The photographer used a special chemical to sensitise the film before taking the picture.
To cause an organism to develop an immune response or hypersensitivity to a particular substance. Repeated exposure to latex proteins can sensitise some healthcare workers, leading to allergic reactions.