I think I got this off of the
ewtn.com site.
Ecclesiastical Latin
Ecclesiastical Latin refers to the pronunciation and usages of Latin by the Catholic Church. In some respects, such as pronunciation, it differs from the Latin spoken by Caesar, Seneca and Cicero, called Classical Latin. Classical Latin is what classics departments in major universities teach, and is also the Latin taught on language tapes, unless Ecclesiastical Latin is specified. A characteristic difference would be the pronunciation of regina coeli. In Classical Latin the “g” is hard and the “c” sounds like “k”. In Ecclesiastical Latin, which is defined as Latin spoken as Italian would be pronounced in Rome, the “g” is soft and the c has a “ch” sound.
The following pronunciation table is adapted from the Liber Usalis, one of the former chant books for Mass and Office. Its introduction to Gregorian Chant is also invaluable.
Vowels
A A is pronounced as in the word Father, never as in the word can. We must be careful to get this open, warm sound, especially when A is followed by M or N as in Sanctus, Nam, etc.
E E is pronounced as in Red, men, met; never with the suspicion of a second sound as in Ray.
I I is pronounced as ee in Feet, never as i in milk or tin.
O O is pronounced as in For, never as in go.
U U is pronounced as oo in Moon, never as in custom.
Y Y is pronounced and treated as the Latin I. (see above)
The pronunciation given for i, o, u, gives the approximate quality of the sounds, which may be long or short; care must be taken to bring out the accent of the word. e.g. mártyr = márteer.
Double Vowels As a general rule when two vowels come together each keeps its own sound and constitutes a separate syllable.
e.g. diéi is di-é-i ; fílii is fíl-i-i ; eórum is e-ó-rum.
OU
AI The rule of each keeping its own sound applies to OU and AI.
e.g. prout is pro-oot ; coutúntur = co-oo-toón-toor ; áit is ah-eet.
AE
OE However, AE and OE are pronounced as one sound, like E above.
e.g. caelum
AU
EU
AY The two vowels form one syllable but both vowels must be distinctly heard. The principle emphasis and interest belongs to the first which must be sounded purely. If on such a syllable several notes are sung, the vocalization is entirely on the first vowel, the second being heard only on the last note at the moment of passing to the following syllable.
EI EI is similarly treated only when it occurs in the interjection:
Hei = Hei , otherwise, Mei = mé-i, etc.
QU
NGU U preceded by Q or NG and followed by another vowel as in words like qui and sanguis, keeps its normal sound and is uttered as one syllable with the vowel which follows : qui, quae, quod, quam, sanguis. But notice that cui forms two syllables, and is pronounced as koo-ee. In certain hymns, on account of the metre, this word can be treated as one syllable.
Consonants
C C coming before e, ae, oe, i, y is pronounced like ch in Church
e.g. caelum = che-loom ; Cecília = che-cheé-lee-a
CC before the same vowels is pronounced T-ch.
e.g. ecce = et-che ; síccitas = seét-chee-tas.
SC before the same vowels is pronounced like Sh in shed
e.g. descendit = de-shén-deet
Except for these cases C is always pronounced like the English K
e.g. cáritas = káh-ree-tas
CH is always like K (even before E or I)
e.g. Cham = Kam, máchina = má-kee-na
G G before e, ae, i, y, is soft as in generous
e.g. mági , génitor , Regína
GN has the softened sound given to those letters in French and Italian.
e.g. (French) agneau , signor , monsignor
The nearest English equivalent would be N followed by y.
e.g. Regnum = Reh-nyoom ; Magnificat = Mah-nyeé-fee-caht
H H is pronounced K in the two words nihil (nee-keel) and mihi (mee-kee)
and their compounds. In ancient books these words are often written
nichil and michi. In all other cases H is mute.
J J, often written as I (e.g. juris or iurus), is treated as Y, forming one sound with the vowel which follows it.
e.g. jam, iam = yam ; alleluia = allelóoya ; major = ma-yor
R When with another consonant, care must be taken not to omit this sound. It must be slightly rolled on the tongue (carnis). Care must be taken not to modify the quality of the vowel in the syllable preceding the R.
e.g. Kyrie: Say Kée-ree-e not Kear-ee-e
sapere: Say sáh-pe-re not sah-per-e
diligere: Say dee-lée-ge-re not dee-lee-ger-e
S S is hard as in the English word sea, but is slightly softened when coming between two vowels. e.g. misericórdia
T T is like the English T, except as below.
TI standing before a vowel and following any letter (except S, X, T) is pronounced tsee.
e.g. patientia = pa-tsee-én-tsee-a
gratia = grá-tsee-a
constitutio = con-stee-tú-tsee-o
laetitia = lae-tée-tsee-a
TH is always simply T. e.g. Thomas, catholicam
X X is pronounced ks, slightly softened when coming between vowels.
e.g. exércitus
XC before e, ae, oe, i, y = KSH.
e.g. excélsis = ek-shél-sees
Before other vowels XC has the ordinary hard sound of the letters composing it.
e.g. excussorum = eks-koos-só-room
Y A Latin vowel, pronounced like I.
Z Z is pronounced dz. zizánia.
B, D, F, K, L, M, N, P, Q and V: Pronounced as in English
Double consonants must be clearly sounded. bello = bel-lo ; terra = ter-ra
Answered by Colin B. Donovan, STL
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