From our post:
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7. Cena dominica sive Missa est sacra synaxis seu congregatio populi Dei in unum convenientis, sacerdote praeside, ad memoriale Domini celebrandum. Quare de sanctae Ecclesiae locali congregatione eminenter valet promissio Christi: "Ubi sunt duo vel tres congregati in nomine meo, ibi sum in medio eorum" (Mt. 18, 20).
"7. The Lord's Supper, or Mass, is the sacred meeting or congregation of the people of God assembled, the priest presiding, to celebrate the memorial of the Lord. For this reason, Christ's promise applies eminently to such a local gathering of holy Church: 'Where two or three come together in my name, there am I in their midst' (Mt. 18:20)."
This is the original complete definition of the Mass according to the 1969 Novus Ordo Missae: they were arguably the most influential liturgical words written in the 20th century and signaled a watershed moment - in a sense, closing the book written since late antiquity and the chapter begun in Sessions XIII and XXII of the Council of Trent.
