DESCRIPTION:
(O Come, O Come, Emmanuel)
Veni, Veni Emmanuel is a synthesis of the great "O Antiphons" that are used for Vespers during the octave before Christmas (Dec. 17-23). These antiphons are of ancient origin and date back to at least the ninth century. The hymn itself was composed in the 12th century in French and the Latin version of the hymn is from the 18th century. There are several arrangements of this hymn. The one below gives all seven verses in the order in which the antiphons appear during the octave before Christmas.
VENI, veni, Emmanuel
captivum solve Israel,
qui gemit in exsilio,
privatus Dei Filio.
R: Gaude! Gaude! Emmanuel,
nascetur pro te Israel!
VENI, O Sapientia,
quae hic disponis omnia,
veni, viam prudentiae
ut doceas et gloriae. R.

VENI, veni, Adonai,
qui populo in Sinai
legem dedisti vertice
in maiestate gloriae. R.

VENI, O Iesse virgula,
ex hostis tuos ungula,
de spectu tuos tartari
educ et antro barathri. R.

VENI, Clavis Davidica,
regna reclude caelica,
fac iter tutum superum,
et claude vias inferum. R.

VENI, veni O Oriens,
solare nos adveniens,
noctis depelle nebulas,
dirasque mortis tenebras. R.

VENI, veni, Rex Gentium,
veni, Redemptor omnium,
ut salvas tuos famulos
peccati sibi conscios. R.

http://www.ccel.org/contrib/latin_hymns/Veni_Veni_Emmanuel.html