IPA: /daɪˈɑːrkəl/
KK: /daɪˈɑrkəl/
Relating to a system of government where two individuals share power equally.
In a diarchal system, both leaders must agree on decisions before implementing them.
Diarchal is formed from "di-" (meaning two) and "archos" (from Greek, meaning ruler or leader). The term refers to a system of governance where two individuals share the ruling power.
Think of 'two' ('di-') rulers ('archos') sharing power — that's what diarchal means.