desensitization

noun

1. the act or process of desensitizing.
2. Physiology, Medicine/Medical. the elimination or reduction of natural or acquired reactivity or sensitivity to an external stimulus, as an allergen.
3. Psychiatry. a behavior modification technique, used especially in treating phobias, in which panic or other undesirable emotional response to a given stimulus is reduced or extinguished, especially by repeated exposure to that stimulus.

n.

1. The reduction or abolition of allergic sensitivity or reactions to a specific allergen.antianaphylaxis
2. The mitigation of an individual’s emotional response to a distressing stimulus by repeated exposure to or imagination of that stimulus.