Ordinary form of the Roman Rite

The Mass of Paul VI is the most commonly used form of the Mass used today within the Catholic Church, first promulgated by Pope Paul VI in the 1969 edition of the Roman Missal after the Second Vatican Council (1962–65). It is considered the Ordinary Form of the Roman Rite mass, as it is intended for use in most contexts. It is also known as the Novus Ordo Missae (New Order of the Mass) or the Novus Ordo, as it is the successor to the Tridentine Mass used since 1570. The 1962 version of the Tridentine Mass is permitted for use as an Extraordinary Form of the Roman Rite mass, according to the norms set forth in the 2007 papal document Summorum Pontificum. Older forms are known as Pre-Tridentine Masses.

In its official documents, the Church identifies the forms of the Roman Rite Mass by the editions of the Roman Missal used in celebrating them. Thus, in his motu proprio Summorum Pontificum of 7 July 2007, Pope Benedict XVI referred to this form of the Roman Rite Mass by linking it with "the Roman Missal promulgated by Pope Paul VI in 1970". The names Mass of Paul VI and Pauline Mass are equivalent to this.

In advance of the 1969 decision on the form of the revision of the liturgy, a preliminary draft of two sections of the Roman Missal was published. The section containing the unvarying part of the Mass is called Ordo Missae (Order of Mass) since at least 1634. In a speech he gave in 1976, Pope Paul VI unremarkably referred to this revised section as "novus Ordo Missae" (the new Order of Mass), novus being Latin for "new". Later, some began to use Novus Ordo Missae, or simply Novus Ordo, as a specific composite term for the entirety of the revised rite of Mass. Traditionalist Catholics often use it in a pejorative manner, and sometimes employ it as a blanket condemnatory term for the present-day Church ("the Novus Ordo Church"). However, "Novus Ordo" appears in no official Church document as a term for the revised form of the Roman Rite Mass.

...
Wikipedia