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Meaning of pentarchy

pen•tar•chy

Pronunciation: (pen'tär-kē), [key]
— pl. -chies.
  1. a government by five persons.
  2. a governing body of five persons.
  3. a federation of five nations, each under its own government or ruler.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.