hypersensitivity /-sen′sətiv″itē/ [Gk, hyper + L, sentire, to feel] , 1. an abnormal condition characterized by an exaggerated response of the immune system to an antigen. See also allergy. 2. increased sensitivity (reactions to tactile, auditory, vestibular, or proprioceptive sensations) or awareness. −hypersensitive, adj.
