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Related to Ember Day: Ember Days and Ember Weeks
A day reserved for prayer and fasting by some Christian churches, observed on the Wednesday, Friday, and Saturday after the first Sunday of Lent, after Whitsunday, after September 14, and after December 13.
any of the days in the quarterly three-day period of prayer and fasting (the Wednesday, Friday, and Saturday after the first Sunday in Lent, after Whitsunday, after Sept. 14, and after Dec. 13) observed in some Western churches.
[before 1050; Middle English; Old English ymbrendæg=ymbryne recurrence (ymb(e) around + ryne a running) + dæg day]