"Twelfthtide : (archaic or obsolete) The season including Epiphany (the twelfth day after Christmas)..."

“Twelfthtide : (archaic or obsolete) The season including Epiphany (the twelfth day after Christmas) and the evening of the preceding day (Twelfth Night), regarded as the end of the Christmas season; Epiphany itself.
In Western Christianity, today is Epiphany, which commemorates the visit of the Magi to the Christ child.”

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