The Tridentine Mass is the form of the Roman Rite Mass contained in the typical editions of the Roman Missal that were published from 1570 to 1962.
It was the most widely celebrated Mass liturgy in the world until the introduction of the Mass of Paul VI in December 1969. In nearly every country it was celebrated exclusively in Latin, but the use of many other languages was authorized both before the Council of Trent and in the course of the succeeding centuries leading to the Second Vatican Council.
The term "Tridentine" is derived from the Latin word Tridentinus, which means "related to the city of Tridentum (modern day Trent, Italy)". It was in response to a decision of the Council of Trent that Pope Pius V promulgated the 1570 Roman Missal, making it mandatory throughout the Western Church, excepting those regions and religious orders whose existing missals dated from before 1370.