The recital of a part of the Office or Mass assigned to a certain feast or day when the whole cannot be said. When two Offices fall on the same day and when, according to the rules of the rebrics, one of them cannot be transferred to another day, it is in part celebrated by way of a commemoration. Offices have different degrees of importance (doubles, semi-doubles, etc.) assigned them at their institution, and it is this that mainly determines precedence in cases of conflict.
At Mass a commemoration consists in saying the collect, Secret, and Post-Communion proper to the feast or day which is being commemorated. In the Office commemorations occur at Lauds and Vespers and consist in reciting the antiphons, with their versicles and responses, of the Benedictus and Magnificat respectively, adding in each case an oremus with the oration proper. These are called special commemorations as distinguished from the common, which are in the Office when the latter is of an inferior rite. These commemorative prayers of the Mass vary according to the season of the year. When two or more special commemorations have to be made, the order is determined by the rank or relative importance of the feasts and Offices. When two Offices fall on the same day there is said to be "occurrence"; and when the second Vespers of a preceding Office coincides with the first Vespers of the following there is "concurrence." When one of the two occurring, or concurring, Offices is very solemn and the other relatively unimportant, all mention of the latter is omitted.
St Nicholas Holy Card
The Catholic Encyclopedia is the most comprehensive resource on Catholic teaching, history, and information ever gathered in all of human history. This easy-to-search online version was originally printed in fifteen hardcopy volumes.
Designed to present its readers with the full body of Catholic teaching, the Encyclopedia contains not only precise statements of what the Church has defined, but also an impartial record of different views of acknowledged authority on all disputed questions, national, political or factional. In the determination of the truth the most recent and acknowledged scientific methods are employed, and the results of the latest research in theology, philosophy, history, apologetics, archaeology, and other sciences are given careful consideration.
No one who is interested in human history, past and present, can ignore the Catholic Church, either as an institution which has been the central figure in the civilized world for nearly two thousand years, decisively affecting its destinies, religious, literary, scientific, social and political, or as an existing power whose influence and activity extend to every part of the globe. In the past century the Church has grown both extensively and intensively among English-speaking peoples. Their living interests demand that they should have the means of informing themselves about this vast institution, which, whether they are Catholics or not, affects their fortunes and their destiny.
Copyright © Catholic Encyclopedia. Robert Appleton Company New York, NY. Volume 1: 1907; Volume 2: 1907; Volume 3: 1908; Volume 4: 1908; Volume 5: 1909; Volume 6: 1909; Volume 7: 1910; Volume 8: 1910; Volume 9: 1910; Volume 10: 1911; Volume 11: - 1911; Volume 12: - 1911; Volume 13: - 1912; Volume 14: 1912; Volume 15: 1912
Catholic Online Catholic Encyclopedia Digital version Compiled and Copyright © Catholic Online