duumvir noun. [dju:'ʌmvǝ] Pl. -virs, in Latin form -viri [-vɪrʌɪ]. E17.
[Latin, sing. from duum virum genit. pl. of duo viri two men.]
In Roman History, of a pair of coequal magistrates or officials; gen. either of two people with joint authority, a coalition of two people.

■ duumvirate noun [Latin duumviratus] (a) the position or office of duumvirs; the joint authority of two people; (b) two people with joint authority, the members of a coalition of people: M17.

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