tri ‧ um ‧ vir ‧ ate /traɪˈʌmvərət, traɪˈʌmvɪrət/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: Latin ; Origin: triumviratus , from triumviri 'committee of three men' , from trium virum 'of three men' ]
formal a group of three very powerful people