1. in the object relations theory of British psychoanalyst Donald Winnicott (1896–1971), an experience in the infant’s maternal environment that is felt to be disturbing. Such experiences are posited to lead to the development of a false self because the infant may develop through a series of reactions to impingements rather than becoming aware of his or her true tendencies and capacities by discovering the environment on his or her own terms.

2. in perception, impact or contact with a sensory receptor. —impinge vb.