Eriksonian UK /ˌɛɹɪkˈsəʊ.ni.ən/US /ˌɛɹɪkˈsoʊ.ni.ən/ adjective1 •Of or relating to the thought and theories of Erik Erikson (1902–1994), a Danish-German-American developmental psychologist and psychoanalyst known for his theory on social development of human beings and for the phrase identity crisis.