Lewis Short
trĭens (noun M) : tres
* A third part, a third of any thing.
* In gen.: cum sciemus, quantum quasi sit in trientis triente,Cic. Att. 7, 8, 3: medicaminis,Col. 12, 20, 7: ut triens ex heminā supersit,Plin. 23, 7, 68, § 133.—Of inheritances: cum duobus coheredibus esse in triente,Cic. Att. 7, 8, 3: heredes ex triente,Suet. Aug. 101.
* In partic.
* Of coins.
* Trientem tertium ... id significare ait Cincius duas libras pondo et trientem, Fest. p. 363.
* As a measure of interest, one third per cent. monthly, or, in our way of reckoning, four per cent. yearly: usurae,Dig. 35, 2, 3 fin.: pensiones,Lampr. Alex. Sev. 21.
* In square or long measure.
* The third of a juger, Col. 5, 1, 11; 5, 2, 2.
* In liquid measure, a third of a sextarius, i. e. four cyathi, Prop. 3, 10 (4, 9), 29; Mart. 1, 107, 8; 6, 86, 1; 9, 88, 2; 10, 49, 1.
* Among mathematicians, the number two (as a third of six), Vitr. 3, 1 med.
Charlton T. Lewis, Charles Short, A Latin Dictionary