triumvir

UK: /traɪˈʌmvə/ US: (trī um′vər)

Inflections of 'triumvir' (n):

triumvir

npl

triumviri

npl

WordReference Random House Unabridged Dictionary of American English © 2025

tri•um•vir  (trī um′vər), n., pl. -virs, -vi•ri 

(-və rī′). 
1. Ancient History [Rom. Hist.] one of three officers or magistrates mutually exercising the same public function.
2. Government one of three persons associated in any office or position of authority.

• Latin: literally, one man of three, back formation from trium virōrum of three men
• 1570–80

tri•um′vi•ral, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

triumvir / traɪˈʌmvə/ noun ( -virs, -viri / -vɪˌriː/)

1. (esp in ancient Rome) a member of a triumvirate

Etymology: 16th Century: from Latin: one of three administrators, from trium virōrum of three men, from trēs three + vir man

triˈumviral adjective