Triumvir: A member of a triumvirate-a board or college of three men. Most famously, the three-man rule of Caesar, Pompey and Crassus. Later, the triumvirate of Antonius, Octavian and Lepidus.
Tunica: A long, loose shirt, sleeveless or short-sleeved, worn by citizens beneath the toga when outdoors and by itself indoors. The tunica laticlava had a broad purple stripe from neck to hem and was worn by Senators and patricians. The tunica angusticlava had a narrow stripe and was worn by the equities. The tunica picta, purple and embroidered with golden palm branches, was worn by a general when he celebrated a triumph.
Usus: The most common form of marriage, in which a man and woman lived together for a year without being separated for three consecutive nights.
Via: A highway. Within the city, viae were streets wide enough for two wagons to pass one another. There were only two viae during the Republic: the Via Sacra, which ran through the Forum and was used for religious processions and triumphs, and the Via Nova, which ran along one side of the Forum.
Vigile: A night watchman. The vigiles had the duty of apprehending felons caught committing crimes, but their main duty was as a fire watch. They were unarmed except for staves and carried fire-buckets.