A group of six; especially a group of six powerful or prominent people.
Origin
Early 18th century; earliest use found in Jonathan Swift (1667–1745), writer and dean of St Patrick's Cathedral, Dublin. From classical Latin sextus sixth + -umvirate.
Definition of sextumvirate in US English:
sextumvirate
nounsɛksˈtʌmvɪrət
A group of six; especially a group of six powerful or prominent people.
Origin
Early 18th century; earliest use found in Jonathan Swift (1667–1745), writer and dean of St Patrick's Cathedral, Dublin. From classical Latin sextus sixth + -umvirate.