Definition of triumvirate noun from the Oxford Advanced Learner's Dictionary

 

triumvirate

 noun
noun
BrE BrE//traɪˈʌmvərət//
 
; NAmE NAmE//traɪˈʌmvərət//
 
(formal)
 
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a group of three powerful people or groups who control something together They appointed a triumvirate of directors. Word Origin late 16th cent.: from Latin triumviratus, from triumvir, originally as triumviri (plural), back-formation from trium virorum ‘of three men’, genitive of tres viri.
See the Oxford Advanced American Dictionary entry: triumvirate