APA Dictionary of Psychology

n. in the thought of German philosopher Martin Heidegger (1889–1976), that aspect of Dasein (being-in-the-world) that is constituted by a person’s relationships and interactions with other people. It was introduced into psychology by Swiss existentialist psychologist Ludwig Binswanger (1881–1966). Compare Eigenwelt; Umwelt. [German, literally: “with world”]