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The Collaborative International Dictionary
Ethnarchy

Ethnarchy \Eth"narch*y\n. [Gr. ?.] The dominion of an ethnarch; principality and rule.
--Wright.

Wiktionary
ethnarchy

n. A population and area of land governed by a single ruler, called an ethnarch, and in which the population is of homogenous ethnicity and the political unit is of insufficient size to be considered a kingdom or nation.