What most people call the “Latin Mass” seems to have a bewildering number of names and many of them are imprecise for one reason or another. Perhaps surprisingly ”Latin Mass” is the least precise of all. But another label, Tridentine, can be used by some naysayers in a way that is downright troublesome.
Among the many names for it, calling the liturgy conducted in Latin and pursuant to the 1962 Missal the “Extraordinary Form” is certainly accurate since Pope Benedict XVI’s Motu Proprio Summorum Pontificum formalized the term, along with the term Ordinary Form for the form of the Mass commonly seen today. Pope Francis seems to prefer calling the Extraordinary Form the Vetus Ordo, or Old Form, which lines up nicely given that the Ordinary Form is also called the Novus Ordo, or New Form. So, regardless of any possible connotations, the benefit of the labels Extraordinary Form or Vetus Ordo for the so-called Latin Mass is that they are precise, accurate and used by popes. Many, though, prefer to call the Traditional Latin Mass/Old Form/Extraordinary Form the “Tridentine Mass,” which, historically speaking, can be both right and wrong, and which is often a springboard to an increasingly common and often deliberate fallacy.