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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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
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