Non-Tridentine Solemn Mass
In the 21st century, the term "solemn Mass", capitalized or not, is increasingly used instead of an analogous celebration in the post-Vatican II form of the Roman Rite of Mass, in which case it has been defined as "a high Mass in which the priest is assisted by two deacons". The functions that the two deacons carry out are indicated in the General Instruction of the Roman Missal and the 1989 edition of the Ceremonial of Bishops,
The terms "Solemn Mass", "Solemn High Mass" and "High Mass" are also often used within Anglo-Catholicism, in which the ceremonial, and sometimes the text, are based on those of the Sarum Rite or the later Tridentine Mass. Lutherans (mainly in Europe) sometimes use the term "High Mass" to describe a more solemn form of their Divine Service, generally celebrated in a manner similar to that of Roman Catholics. Examples of similarities include vestments, chanting, and incense. Lutheran congregations in North America commonly celebrate High Mass more or less, but rarely use the term "Mass".
This article deals only with Tridentine Solemn Mass as regulated by the rubrics of editions of the Roman Missal published between the Council of Trent and the Second Vatican Council.