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.
ETYMOLOGY:
Middle English ymer daye, from Old English ymbrendæg : ymbryne, recurrence, course of time ( ymbe, around; see ambhi in Appendix I + ryne, a running; see rei- in Appendix I) + dæg, day; see day.
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