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n. pl. tri·um·virs or tri·um·vi·ri (-və-rī′)
1. One of three men sharing public administration or civil authority in ancient Rome.
2. One of three people sharing public administration or civil authority.
[Middle English, from Latin, back-formation from triumvirī, board of three, from trium virum, of three men : trium, genitive pl. of trēs, three; see trei- in Indo-European roots + virum, archaic genitive pl. of vir, man; see wī-ro- in Indo-European roots.]
n, pl -virs or -viri (-vɪˌriː)
(Historical Terms) (esp in ancient Rome) a member of a triumvirate
[C16: from Latin: one of three administrators, from trium virōrum of three men, from trēs three + vir man]
n., pl. -virs, -vi•ri (-vəˌraɪ)
1. one of three officers or magistrates of ancient Rome jointly exercising the same public function.
2. one of three persons associated in any office or position of authority.
[1570–80; < Latin, back formation from trium virōrum of three men]
n (Hist) → Triumvir m