resensitization

noun

1. the state or process of being sensitized.
2. Psychology. the process of becoming susceptible to a given stimulus that previously had no effect or significance.
3. Immunology.
   1. a state or condition in which a previously encountered foreign substance triggers an immune reaction.
   2. an immunologic state or condition that is evidenced by the acquired ability of a cell or individual to detect the presence of a foreign substance upon reexposure to the substance and to react immunologically.

n.

1. The act or process of inducing an acquired sensitivity or allergy.