dichotomization
/dʌɪˌkɒtəmʌɪˈzeɪʃn/ /dɪˌkɒtəmʌɪˈzeɪʃn/noun
The condition of being, or process of becoming, dichotomized; division into two sharply defined parts or mutually exclusive categories.
Origin
Mid 19th century. From dichotomize + -ation. Compare earlier dichotomizing.