Major celebrations of the church year for which the Prayer Book appoints proper collects, psalms, and lessons. They include the seven principal feasts (Easter Day, Ascension Day, Pentecost, Trinity Sunday, All Saints' Day, Christmas Day, and the Epiphany), Sundays, and major holy days (including feasts of our Lord, all feasts of apostles, all feasts of evangelists, and other designated feasts [see BCP, pp. 15-17, 31-33]). See Lesser Feasts and Fasts.
Glossary definitions provided courtesy of Church Publishing Incorporated, New York, NY,(All Rights reserved) from "An Episcopal Dictionary of the Church, A User Friendly Reference for Episcopalians," Don S. Armentrout and Robert Boak Slocum, editors.