noun, plural pen·tar·chies.

a government by five persons.
a governing body of five persons.
a federation of five nations, each under its own government or ruler.

Origin of pentarchy

From the Greek word pentarchía, dating back to 1580–90. See pent(a)-, -archy
Related formspen·tarch, nounpen·tar·chi·cal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for pentarch


noun plural -chies

government by five rulers
a ruling body of five
a union or association of five kingdoms, provinces, etc, each under its own ruler
a country ruled by a body of five
Derived Formspentarchical, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012