quadrumvirate
noun
qua·drum·vi·rate kwä-ˈdrəm-və-rət 
: a group or association of four
Example Sentences
Recent Examples on the Web The fourth member of private equity's leading quadrumvirate has also been busy: The Carlyle Group unveiled plans this week to acquire Saama Technologies for up to $430 million, marking the firm's latest bet on the life sciences sector. 
Kevin Dowd, Forbes, 24 Oct. 2021 Yet again, Miller has amassed a consensus top-three recruiting class, a quadrumvirate of top-120 recruits split between a pair of frontcourt and backcourt prospects. Dan Greene, SI.com, 10 July 2017
Kevin Dowd, Forbes, 24 Oct. 2021 Yet again, Miller has amassed a consensus top-three recruiting class, a quadrumvirate of top-120 recruits split between a pair of frontcourt and backcourt prospects. Dan Greene, SI.com, 10 July 2017 Word History
Etymology
quadri- + -umvirate (as in triumvirate)
First Known Use
1752, in the meaning defined above