Answer:

latin

Answer	Crossword Clue
LATIN	Igpay anguagelay
LATIN	Ancient language
LATIN	Parisian Quarter

LATIN	Quarter or pig
LATIN	It's spoken in high school and that's about it
LATIN	Forum language
LATIN	Liturgical language
LATIN	Livy's lingo
LATIN	Ovid's tongue
LATIN	Forum lingo
LATIN	Lingo of the masses?

LATIN	English root
LATIN	Mass medium?
LATIN	Like much legalese
LATIN	Source of much legalese
LATIN	Language for legal terminology
LATIN	Classic subject
LATIN	Pig ...
LATIN	Quorum's origin

LATIN	"Aeneid" language
LATIN	Pig ..
LATIN	Language of many courtroom phrases
LATIN	Romance languages ancestor
LATIN	Tongue of Tiberius
LATIN	What Forum addresses were in
LATIN	Hogwarts motto language
LATIN	Like about half of American states' mottos

LATIN	Language for the masses?
LATIN	Pig or vulgar
LATIN	Type of cross or square
LATIN	One-time language of the Masses?
LATIN	Pig language?
LATIN	Livy's language
LATIN	Mass confusion?
LATIN	Whence many loanwords

LATIN	Language that may be vulgar
LATIN	Status quo language?
LATIN	Vatican City's official language
LATIN	Language for the masses
LATIN	Mass communication?