Cyclopedia of Biblical, Theological and Ecclesiastical Literature
the forms of prayer used in Romish and Episcopal churches. Before the Reformation the offices of the Church consisted in missals, breviaries, psalteries, graduals, and pontificals. See under the respective titles, and also the article (See OFFICE, THE DIVINE).
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McClintock, John. Strong, James. Entry for 'Offices'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/o/offices.html. Harper & Brothers. New York. 1870.