Some info about LATIN
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QUOTES AND PHRASES
Agnus Dei is the Latin name under which the "Lamb of God" is honoured within the Catholic Mass and other Christian liturgies descending from the Latin liturgical tradition. It is the name given to a specific prayer that occurs in these liturgies, and is the name given to the music pieces that accompany the text of this prayer.[1][2]
Wikipedia contributors, "Agnus dei," Wikipedia, The Free Encyclopedia,
ABOUT THE LATIN LANGUAGE