Duo

English-Latin

duo. n.

1. A pair; a couple.
   • par (paris, neut.)

Latin-English

dŭ|ŏ, -ae, -ŏ. (du.o) adj.

1. Two.

[Proto-Indo-European *duwo-.]

Declension

First and second adjective declension
masc.	nom.	gen.	dat.	acc.	voc.	abl.
plur.	dŭŏ	dŭōrum	dŭōbus	dŭōs dŭŏ	dŭŏ	dŭōbus
fem.
plur.	dŭae	dŭārum	dŭābus	dŭās	dŭae	dŭābus
neut.
plur.	dŭŏ	dŭōrum	dŭōbus	dŭŏ	dŭŏ	dŭōbus

Loci

• αʹ Vitruvius, De Architectura 10.2:

Cum vero in ima troclea duo orbiculi, in superiore tres versantur, id pentaspaston dicitur.

But it is called a pentaspaston when there are two sheaves turning in the bottom block and three in the upper one.

• βʹ Cicero, Ad Atticum 9.6:

Hic numerus est hominum milia triginta et consules duo et tribuni pl. et senatores qui fuerunt cum eo omnes cum uxoribus et liberis.

This is the tally: thirty thousand men, two consuls, the plebeian tribunes and the senators who were with him, all of them with their wives and children.

• γʹ Cicero, Ad Atticum 10.8:

Duarum rerum simulationem tam cito amiserit, mansuetudinis in Metello, divitiarum in aerario.

He had lost, so quickly, his claim to two things—to gentleness because of Metellus, and to riches because of the treasury.

• δʹ Vitruvius, De Architectura 10.2.6:

Ita funis ductarius traicitur in inferioris trocleae foramen, uti aequalia duo capita sint funis, cum erit extensus, ibique secundum inferiorem trocleam resticula circumdata et contenta utraeque partes funis continentur, ut neque in dextram neque in sinistram partem possint prodire.

So the tow rope is fed through an opening in the lower block, so that both ends of the rope are even when it is stretched out, and then both parts are held along the lower block by a cord wrapped around and tied so that they can't come out, either on the right side or the left.

• εʹ Caesar, ap. Cicero, Ad Atticum 9.7c:

iam duo praefecti fabrum Pompei in meam potestatem venerunt et a me missi sunt.

At this point two of Pompey's prefects of engineers have come into my power, and I have let them go.