Definition of acephalisis in English:
acephalisis
noun eɪˌkɛfəˈlʌɪsɪseɪˌsɛfəˈlʌɪsɪs
rare The condition of being without a leader or head; lack of leadership.
Origin
Early 17th century; earliest use found in John Speed (d. 1629), historian and cartographer. From ancient Greek ἀκέϕαλος headless + -sis.