The Nuttall Encyclopedia
In the Roman Catholic Church a portion of the liturgy chanted at the commencement of the eucharistic service, also in the English the part of the service read during the collection of the alms at communion.
Wood, James, ed. Entry for 'Offertory'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/o/offertory.html. Frederick Warne & Co Ltd. London. 1900.