d(y)üˈəmvər, -ˌvi(ə)r noun
( plural duumvirs -rz ; also duumvi·ri -_vəˌrī, -ˌrē)
Etymology: Latin, from duum of two (gen. of duo two) + vir man — more at two , virile
1. : one of two Roman officers or magistrates constituting a board, commission, or court appointed for a specific function
2. : one of two men jointly holding power or associated in some official position