A quick note as I had to look it up and might save somebody else some time. First occurring on p. 7 of the Hullot-Kentor translation of Aesthetic Theory , χωρισμός or chorismos, can most accurately be translated as "separation". The context, for search engine purposes is "by abstract negation posits the χωρισμός of art as absolute". (Adorno, Theodor W. Aesthetic Theory. Edited by Gretel Adorno and Rolf Tiedemann.
Martin Paul Eve (Fri,) studied this question.