exposure refers to a behavior therapy technique for treating anxiety disorders that exposes the subject to the source of his or her fear while providing appropriate and effective ways of coping with the fear (other than through escape and avoidance ).
Other /More definition:
Exposure refers to a form of treatment in which clients are presented with the stimuli they fear. It is a behavior therapy technique for treating Anxiety disorders that exposes the subject to the source of his or her fear while providing appropriate and effective ways of coping with the fear other than through escape and avoidance.