Definition of ethnarchy in US English:

ethnarchy

noun

historical
  • 1Chiefly Ancient History. A territory or province ruled or governed by an ethnarch.

  • 2The office or position of ethnarch; the period of office of an ethnarch.

Origin

Early 17th century; earliest use found in Lodowick Lloyd (fl. 1573–1607). From (i) Middle French ethnarchie.

Pronunciation

ethnarchy

/ˈɛθnɑːki/