What is the meaning of the word "sensitise"?

Definitions:

  1. make (a material) sensitive to light, often of a particular colour, by coating it with a photographic emulsion copy to clipboard verb
    • sensitize the photographic film copy to clipboard
  2. make sensitive or aware copy to clipboard verb
    • I was not sensitized to your emotional needs. copy to clipboard
  3. make sensitive to a drug or allergen copy to clipboard verb
    • Longterm exposure to this medicine may sensitize you to the allergen copy to clipboard

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