The American Church Dictionary and Cycopedia
Those services of the Prayer Book which are not in constant use, but used only as occasion may require, such as the Office for Holy Matrimony, the Order for the Burial of the Dead, the Order for Confirmation, the Baptismal services, Visitation of the Sick, etc.
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Miller, William James. Entry for 'Occasional Offices'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/o/occasional-offices.html. 1901.