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The American Church Dictionary and Cycopedia
The name given to the Sunday next before Lent, because it is the fiftieth day before Easter; Quinquagesima meaning fiftieth. (See SEPTUAGESIMA.)
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Miller, William James. Entry for 'Quinquagesima'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/q/quinquagesima.html. 1901.