Well this is what you get when History is not taught in school. You get what you get.
Latin is the official language of the. Drum roll… "The Latin Church"
But in beginning it was not so, when the Church began in Jesus time the “lingua franca” was Greek. Lingua franca is a term that comes from Latin. It means the language used universally mainly for commerce and communicatios. Today it is English.
Ask your friend: why are Latin terms used by the US Courts today"
Here is a list of Legal Terminology in Latin:
a fortiori - With stronger
reasona priori - From the cause to the effect
ab initio - From the beginning
actiones in personam - Personal actions
ad curiam - Before a court; to court
ad damnum clause - To the damage, clause in a complaint stating monetary lossad faciendum - To do
ad hoc - For this purpose or occasion
ad litem - For this suit or litigation
ad valorem - According to the value
adversus - Against
alias dictus - An assumed name
alibi - In another place, elsewhere
aliunde - From another place, from without (as in evidence outside the document)
amicus curiae - “friend of the court” brief
animo - With intention, disposition, design or will
animus - Mind or intention
ante litem motam - before the suit or before litigation is filed
arguendo - In the course of an argument
assumpsit - He undertook or promised
bona fide - Good faith
capias - Take, arrest
captia - Persons, or heads
causa mortis - By reason of death
caveat emptor - “Let the buyer beware”
certiorari - “send the pleadings up”, indicating a discretionary review process
Cestui que trust - Beneficiaries of a trust
circa - In the area of, about or concerning
compos mentis - Of sound mind
consortium - The conjugal fellowship of husband and wife
contra - Against
coram nobis - Before us
corpus delicti - Body of the offense
cum testamento annexo - “With the will annexed”.
Latin is also used extensively by the Sciences, ask your friend is it because they want to hide things from us?
But I digress, when the first Pope moved to Rome and became her bishop. Greek was the business and government language. Rome was the seat of the Roman empire. The Romans did not impose their native language to the Empire, they accepted that most people already spoke Greek for commerce and they kept it that way. Romans were pragmatic people. Don’t fix what works kinda people.
The Bishop of Rome however had to preach to the “Vulgo” this is another Latin word, it means “the people”. Yes, Latin was the language used by all the people living in Rome and around the Roman area. So having mass in Greek would not do. Either the Church would need to teach all the people of Rome Greek OR adapt the liturgy so that they could participate in it.
Of course this did not take place overnight, it has been an ongoing affair since the beginning.
And today we have the same Liturgy is every conceivable language spoken on the planet.
One reticence in changing the Liturgy to any “new” language is the zeal the Church has for the meaning to be faithfully kept no matter which language it is officiated in. And that is a good thing.
Hope this helps.
Peace!